Chemical formula of galena

Troilite has a chemical composition of FeS, while pyrrhotite's chemical composition is Fe (1-x) S. Pyrrhotite is deficient in iron because some of the iron sites in its crystal lattice are vacant (empty). That is why the iron in the formula has a subscript of 1-x. The value of "X" in the chemical formula of pyrrhotite can range between 1 and 0.17.

Chemical formula of galena. PERCENT TO FORMULA ! We are given the following chemical analysis of a pyroxene. Compute its formula: (Hint: Jadeite NaAlSi 2O 6 – Diopside: CaMgSi 2O 6) Oxide wt. % MolWt oxide Moles oxide Moles cation Mole oxygen Prop cations to O6 SiO 2 56.64 60.086 0.9426 0.9426 1.8852 2 Na 2O 4.38 61.99 0.0707 0.1414 0.707 0.3 Al 2O

Sphalerite (sometimes spelled sphaelerite) is a sulfide mineral with the chemical formula ( Zn, Fe) S. [5] It is the most important ore of zinc. Sphalerite is found in a variety of deposit types, but it is primarily in sedimentary exhalative, Mississippi-Valley type, and volcanogenic massive sulfide deposits.

Oct 16, 2023 · Gypsum is the mineral that includes in its structure Sulfate ion, which makes it a sulfate mineral, and of all the sulfate minerals, Gypsum is the most common. Gypsum is composed of hydrated calcium sulfate, and its chemical formula is CaSO4.2H2O. It is a natural salt mineral, that is to say, an evaporite mineral, and is mostly found along with ... The galena chemical formula is PbS. The chemical formula represents one atom of lead bonded to one atom of sulfur. The smelting of galena can be represented as the following chemical...General Galena Information : Chemical Formula: PbS : Composition: Molecular Weight = 239.27 gm Lead 86.60 % Pb Sulfur 13.40 % S _____ 100.00 % : Empirical Formula: …Galena is an ore of lead (Pb). Chemically it is lead sulphide ( PbS ) . To obtain lead (Pb) from it, galena ( PbS ) is first converted into lead oxide ( PbO ) by reacting it with oxygen followed by reduction of lead oxide ( PbO ) by carbon (C).Magnetite is a black, opaque, magnetic mineral that leaves a black streak when rubbed across a hard rough surface. It is one of the most abundant metal oxides, and its crystal structure contains both the ferrous (Fe+2) and ferric (Fe+3) forms of iron ions. A complex pattern of electrons between the two forms of iron is the source of its ...The chemical formula of sulphide is also S 2−. Many metallic elements, including sulphides, are usually found to occur naturally as minerals. For example, pyrite, which is a sulphide of iron with the formula FeS 2, is one of the most abundant sulphur minerals. In addition, mercury, copper, silver, zinc, cadmium and many other elements tend to ...

Sphalerite, also known as blende or zinc blende, is the major ore of zinc. When pure (with little or no iron) it forms clear to white crystals (known as Cleiophane ). Yellow to orange sphalerite is often called "golden sphalerite." Red shades of sphalerite are known as Ruby Blende or Ruby Jack. As iron content increases, sphalerite forms dark ...This problem has been solved! You'll get a detailed solution from a subject matter expert that helps you learn core concepts. Question: What is the maximum mass of pure lead that could be extracted from 5.0 kg of galena, a lead ore with the chemical formula PbS? Be sure your answer has a unit symbol, if necessary, and is rounded to 2 ...Table 2.4 The main mineral groups and some examples of minerals in each group. [Skip Table] Group. Examples. Oxides. Hematite (iron oxide Fe 2 O 3 ), corundum (aluminum oxide Al 2 O 3 ), water ice (H 2 O) Sulphides. Galena (lead sulphide PbS), pyrite (iron sulphide FeS 2 ), chalcopyrite (copper-iron sulphide CuFeS 2)Physical Properties: Chemical Formula: PbS: Class: Sulfide: Crystal system: Cubic: Habit: Cubic Cubes modified by octahedra: Color: Lead gray Silvery: Hardness: 2.5 ... This problem has been solved! You'll get a detailed solution from a subject matter expert that helps you learn core concepts. Question: What is the maximum mass of pure lead that could be extracted from 130g of galena, a lead ore with the chemical formula PBs? Be sure your answer has a unit symbol, if necessary, and is rounded to the correct ... Chemical Formula: S8 : Composition: Molecular Weight = 256.53 gm Sulfur 100.00 % S _____ 100.00 % : Empirical Formula: S 8: Environment: Volcanic exhalations and bacterial reduction of sulfates in sediments. IMA Status: Valid Species (Pre-IMA) Prehistoric : Locality: Notable localities are in Sicily, Italy and salt domes of the United States ...Question: Part A Referring to the table given below, write a balanced equation for the dissolving of galena in hydrochloric acid. The products are hydrogen sulfide gas and load (II) chloride. Table Some Nonsilicate Minerals of Economic Importance Mineral Type Name Chemical Formula Source and/or Use Hematite FeO3 Ore of iron; pigment Oxide ...Chemical formula of Mineral Galena. Pbs. Metallic Luster means. mineral looks like a metal. Hardness of 2.5 means. can scratch mineral with fingernail. cubic cleavage means cleavage is going in. two directions at right angles. PbS.

Chemical Group Chemical Formula Quartz Framework silicate SiO 2 Potassium Feldspar (Orthoclase) Framework silicate KAlSi 3 O8 Plagioclase Feldspar Framework silicate (Ca, Na)Al 1-2 Si 2-3 O 8 ... Metallic Galena 1 to 2 Gray to black Poorly defined cleavage in one direction Dark gray to black, marks paper Metallic to dull or greasyWhat is galena's chemical formula? Galena is lead (II) sulfide, PbS. What is the chemical name for galena? Galena's chemical name is - lead sulfide (PbS)A major and primary Lead mineral is galena (chemical formula = PbS) which comprises of 86.6% of Lead [1]. In order to smelt this mineral, a blast furnace is ...This problem has been solved! You'll get a detailed solution from a subject matter expert that helps you learn core concepts. Question: What is the maximum mass of pure lead that could be extracted from 130g of galena, a lead ore with the chemical formula PBs? Be sure your answer has a unit symbol, if necessary, and is rounded to the correct ...Colorless to white, often tinted grey, yellow, green or blue; colourless in transmitted light. Named in 1832 by Francois Sulpice Beudant for the type locality, the Parys Mine on the Island of Anglesey (Ynys Môn) in Wales, U.K. Baryte Group. Along with cerussite, the most common secondary lead mineral.

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Ex planation: The sulphide minerals are compounds of the metals with sulphur. Some ot the examples are: Galena- ore of lead Formula is PbS. Cinnabar-ore of mercury Formula is HgS. Copper pyrites-ore of copper. formula is CuFeS 2. Hence option A,B,D are correct. Solve any question of General Principles and Processes of Isolation of Elements with:-.Pyrite, also known as “fool’s gold,” is a common iron sulfide mineral with the chemical formula FeS2. It forms in a variety of geological settings through several processes. Formation: Pyrite forms under reducing conditions, typically in environments with low oxygen levels, high sulfur content, and abundant iron.Chalcopyrite has a chemical composition of CuFeS2, which indicates that it is composed of copper (Cu), iron (Fe), and sulfur (S) atoms. It is a sulfide mineral, with copper and iron being the main cations and sulfur as the anion. Crystal Structure: Chalcopyrite has a unique crystal structure that belongs to the tetragonal system.Minerals (O-S) » Kirkby Teaching Materials Galena Sulfide mineral About Galena In Our Earth In Our Society In Our Future In the Upper Midwest Gallery Galena Properties Commonly confused with... Did you know... Galena is the most abundant lead mineral, has been mined for millennia, and remains our major source of that metal.

The galena chemical formula is PbS. The chemical formula represents one atom of lead bonded to one atom of sulfur. The smelting of galena can be represented as the following chemical...Galena is a lead sulfide mineral that crystallizes in the form of masses, cubes, octahedrons, and fibrous layers. Today, it's the most important lead ore when it comes to the …Study with Quizlet and memorize flashcards containing terms like Which of the following is a mineral? A. glass B. salt (NaCl) C. sugar (formula C6H12O6) D. amber (tree sap), Which of the following is NOT a mineral? A. an oyster shell, because it's not crystalline B. oil, because it's a liquid, not a solid C. pyrite, because it's a chemical compound D. a gold nugget, …Les minéraux entre le Big Bang et les étoiles. MinDat.org (Jolyon Ralph listings) Mineralogy Club of Antwerp, Belgium (Michael Cooper list) MinLex (Deutsch) "Mineral Lexicon". MinMax (Deutsch) MinMax (English) The Mineral and Gemstone Kingdom. Over 4,714 mineral species descriptions are included in this HTML-linked alphabetical listing of all ... Sphalerite is often found with galena, a lead ore. Sphalerite is a mineral, mixed with zinc and iron sulfide. The chemical formula of Sphalerite is (Zn, Fe)S. The dispersion of sphalerite (0.156) is three times that of diamond, which has a …Colorless to white, often tinted grey, yellow, green or blue; colourless in transmitted light. Named in 1832 by Francois Sulpice Beudant for the type locality, the Parys Mine on the Island of Anglesey (Ynys Môn) in Wales, U.K. Baryte Group. Along with cerussite, the most common secondary lead mineral.Chemical Formula: PbS Locality: Joplin district of Missouri, Kansas, and Oklahoma and other world wide occurrences. Name Origin: The Roman naturalist, Pliny, used the name galena to describe lead ore. Galena, also called lead glance, is the natural mineral form of lead(II) sulfide. It is the most important ore of lead and an important source of ...The chemical formula of galena is PbS (lead sulfide). It belongs to the isometric crystal system, most common crystal shapes are cubes, octahedrons, and their combinations. The dodecahedron crystal shapes are much less common, over 40 galena crystal shapes are known. Twinning is common on {111} (spinel law twins).Study with Quizlet and memorize flashcards containing terms like Which of the following is a mineral? A. glass B. salt (NaCl) C. sugar (formula C6H12O6) D. amber (tree sap), Which of the following is NOT a mineral? A. an oyster shell, because it's not crystalline B. oil, because it's a liquid, not a solid C. pyrite, because it's a chemical compound D. a gold nugget, …

Lead(II) oxide, also called lead monoxide, is the inorganic compound with the molecular formula Pb O.PbO occurs in two polymorphs: litharge having a tetragonal crystal structure, and massicot having an orthorhombic crystal structure.Modern applications for PbO are mostly in lead-based industrial glass and industrial ceramics, including computer …

Malachite is a green copper carbonate hydroxide mineral with a chemical composition of Cu 2 (CO 3 ) (OH) 2. It was one of the first ores used to produce copper metal. It is of minor importance today as an ore of copper because it is usually found in small quantities and can be sold for higher prices for other types of use.Galena, also called lead glance, is the natural mineral form of lead(II) sulfide (PbS). It is the most important ore of lead and an important source of silver. Galena is one of the most abundant and widely distributed sulfide minerals. It crystallizes in the cubic crystal system often showing octahedral forms.Chemical Formula: S8 : Composition: Molecular Weight = 256.53 gm Sulfur 100.00 % S _____ 100.00 % : Empirical Formula: S 8: Environment: Volcanic exhalations and bacterial reduction of sulfates in sediments. IMA Status: Valid Species (Pre-IMA) Prehistoric : Locality: Notable localities are in Sicily, Italy and salt domes of the United States ...Most lead is mined from the most abundant lead ore, Galena (lead(II) sulfide)(1). The lead deposits now being mined in the USA consist of almost pure galena, some of which contain over 70% lead(2). Most of lead mined in the USA is in southeastern Missouri(2). In both lead and zinc circuits, pyrite is the main sulphide gangue mineral. It is critical to decrease the presence of iron (Fe) and Zn in the lead concentrate during the flotation of galena.Sugar: Common table sugar, or sucrose, is a hydrate. Its chemical formula is C12H22O11·H2O, indicating the presence of one water molecule per sucrose molecule. This water molecule contributes to the crystalline structure of sugar. Honey: Honey is a natural sweetener that contains water molecules as hydrates.Of the several properties used for identifying minerals, it is good to consider which will be most useful for identifying them in small grains surrounded by other minerals. Figure 3.6.1 3.6. 1: The rover Curiosity drilled a hole in this rock from Mars, and confirmed the mineral Hematite, as mapped from satellites.

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Malachite is the another copper carbonate hydroxide mineral with chemical formula [Cu2 CO 3 (OH) 2] formed by the weathering of copper orebodies in the vicinity. The color is bright green ( Fig. 1.14) with light green streak. The hardness and specific gravity varies between 3.5–4.0, and 3.6–4.0, respectively.Malachite is the another copper carbonate hydroxide mineral with chemical formula [Cu 2 CO 3 (OH) 2] formed by the weathering of copper orebodies in the vicinity.The color is bright green (Fig. 1.14) with light green streak.The hardness and specific gravity varies between 3.5–4.0, and 3.6–4.0, respectively. The mineral in the purest form contains 57.48% Cu.You'll get a detailed solution from a subject matter expert that helps you learn core concepts. Question: What is the maximum mass of pure lead that could be extracted from 4.0 kg of galena, a lead ore with the chemical formula PbS? Be sure your answer has a unit symbol, if necessary, and is rounded to the correct number of significant digits. . Lead is a chemical element with the symbol Pb (from the Latin plumbum) and atomic number 82. It is a heavy metal that is denser than most common materials. Lead is soft and malleable, and also has a relatively low melting point. When freshly cut, lead is a shiny gray with a hint of blue. ... Galena is a principal ore of lead which often bears ...The name "biotite" is used in the field and in entry-level geology courses because these minerals generally cannot be distinguished without optical, chemical, or x-ray analysis.. Biotite is a rock-forming mineral found in a wide range of crystalline igneous rocks such as granite, diorite, gabbro, peridotite, and pegmatite.It also forms under metamorphic …Chemical Formula: Fe++Fe+++2O4 : Composition: ... Empirical Formula: Fe 3+ 2 Fe 2+ O 4: Environment: Common accessory mineral in igneous and metamorphic rocks. Can be ...Vanadinite. Vanadinite is a mineral belonging to the apatite group of phosphates, with the chemical formula Pb 5 ( V O 4) 3 Cl. It is one of the main industrial ores of the metal vanadium and a minor source of lead. A dense, brittle mineral, it is usually found in the form of red hexagonal crystals. It is an uncommon mineral, formed by the ...Galena is a lead sulfide mineral with a chemical composition of PbS. It is the world's primary ore of lead and is mined from a large number of deposits in many countries. It is found in igneous and metamorphic rocks in medium- to low-temperature hydrothermal veins.Chemical Formula: (Zn,Fe)S : Composition: Molecular Weight = 96.98 gm Zinc 64.06 % Zn Iron 2.88 % Fe Sulfur 33.06 % S _____ 100.00 % : Empirical Formula: Zn 0.95 Fe 2+ 0.05 S : Environment: In sulfide ore veins in all rock classes. IMA Status: ... False Galena : ICSD 60378 : Mock Lead Ore : Mátraite - densely twinned : PDF 5-566 ….

Galena Pb model ages date the accumulation of primary Pb-Zn stocks during oceanic anoxic events. • The isotopic composition of frozen Pb indicates that galena from black shales constitutes the source of Pb-Zn deposits. • Pb model ages of K-feldspars from granitic plutons reflect local circulation of sediments rather than magmatic emplacement.anglesite, naturally occurring lead sulfate (PbSO 4 ). A common secondary mineral that is a minor ore of lead, it is usually formed by the oxidation of galena and often forms a concentrically banded mass surrounding a core of unaltered galena. The formation of cerussite (lead carbonate) often accompanies or follows the formation of anglesite.Galena Meanings, Zodiacs, Planets, Elements, Colors, Chakras, and more. Science & Origin of GalenaGalena is a lead sulfide mineral that crystallizes in the form of masses, cubes, octahedrons, and fibrous layers. Today, it's the most important lead ore when it comes to the production of goods. This mineral was first described back in 77 A.D. by Gaius Plinius Secundus (Pliny the Elder). He named ... Galena is very soft and has perfect cleavage. Care must be taken not to damage the crystals. The mineral will tarnish if exposed to the elements. It is a lead sulfide mineral so please wash hands after handling. This Galena gemstone guide lists qualities of the Galena gem type, including stone colors, common names, meanings, gemstone hardness ...Chemical Properties of Chromate – CrO 42-. Chromate ion acts as a strong oxidizing agent in acid solution. In an alkaline solution chromate ion combines with water to form chromium (III) hydroxide. CrO42− + 4 H2O + 3 e− → Cr (OH)3 + 5 OH−. Chromate as its potassium salt reacts with barium nitrate to form barium chromate and potassium ...Dolomite is a common rock-forming mineral. It is a calcium magnesium carbonate with a chemical composition of CaMg (CO 3) 2. It is the primary component of the sedimentary rock known as dolostone and the metamorphic rock known as dolomitic marble. …. Dolomite is also a common mineral in hydrothermal veins.Because of the lead in the chemical formula, it is much denser than other minerals, which makes it seem unnaturally heavy for its size GREAT FOR GEOLOGY ...Arsenopyrite was observed to be more reactive than pyrite, chalcopyrite, galena, and sphalerite. Oxidation of arsenopyrite led to the formation of scorodite on the surface. The activation energies for arsenopyrite oxidation varied from 18 kJ mol − 1 at 0–25 °C to a slightly negative E a of 6 kJ mol − 1 at 25–60 °C. Chemical formula of galena, Lead(II) sulfide (also spelled sulphide) is an inorganic compound with the formula Pb S. Galena is the principal ore and the most important compound of lead. It is a …, What is galena's chemical formula? Galena is lead (II) sulfide, PbS. What is the chemical name for galena? Galena's chemical name is - lead sulfide (PbS), composition but must also be homogeneous out- side the resotrution of the ... Most chemical data on galena previously de- scribed in the literature were ..., Lead(II) sulfate, also known as plumbous sulfate, is a chemical compound. Its chemical formula is PbSO 4. It contains lead and sulfate ions. The lead is in its +2 oxidation state. Properties. Lead(II) sulfate is a white solid. It does not dissolve in water. It is toxic because it has lead in it. It does not dissolve in sulfuric acid, Chemical Composition: Calcium Carbonate: Ca(CO3), Mn, Fe, Mg and Sr may partially replace Ca in some samples. Color: Transparent to translucent calcite crystals are colorless, white or light-colored; massive forms of calcite are typically buff, gray, or white. Cleavage: Calcite has perfect cleavage in three directions to produce rhombohedra., Magnetite is a black, opaque, magnetic mineral that leaves a black streak when rubbed across a hard rough surface. It is one of the most abundant metal oxides, and its crystal structure contains both the ferrous (Fe+2) and ferric (Fe+3) forms of iron ions. A complex pattern of electrons between the two forms of iron is the source of its ..., Galena has been mined for lead and silver since the time of the Romans. It is a form of lead sulfide. The chemical formula is PbS. ... The chemical formula is Cu 3 [OH CO 3] 2 and results from the oxidation of copper sulfides. Malachite is a copper carbonate with a chemical formula of Cu 2 [(OH) 2 CO 3]. It is a vibrant green color often banded ..., Les minéraux entre le Big Bang et les étoiles. MinDat.org (Jolyon Ralph listings) Mineralogy Club of Antwerp, Belgium (Michael Cooper list) MinLex (Deutsch) "Mineral Lexicon". MinMax (Deutsch) MinMax (English) The Mineral and Gemstone Kingdom. Over 4,714 mineral species descriptions are included in this HTML-linked alphabetical listing of all ..., Galena is a rocksalt group, sulfide mineral with a chemical formula of PbS. Find facts and data about Galena. , Most lead is mined from the most abundant lead ore, Galena (lead(II) sulfide)(1). The lead deposits now being mined in the USA consist of almost pure galena, some of which contain over 70% lead(2). Most of lead mined in the USA is in southeastern Missouri(2)., galena, also called lead glance, a gray lead sulfide (PbS), the chief ore mineral of lead., Galena is a gray, cubic, shiny, dense mineral most commonly associated with lead. It is one of the earliest minerals used by humans, and one of the most abundant sulfide minerals on the Earth. Relation to Mining. Galena is still mined today in large quantities, not only for lead, but also for silver. Uses, The chemical formula of galena is PbS, which means that one molecule of galena is composed of one atom of lead (Pb) and one atom of sulfur (S). First, we need to calculate the molar mass of PbS. The molar mass of lead (Pb) is approximately 207.2 g/mol and the molar mass of sulfur (S) is approximately 32.06 g/mol., Here's how you can do that. You're dealing with a double replacement reaction in which two soluble ionic compounds in aqueous solution react to form an insoluble ..., Question: What is the maximum mass of pure lead that could be extracted from 110. g of galena, a lead ore with the chemical formula PbS? Be sure your answer has a unit symbol, if necessary, and is rounded to the correct number of significant digits. al. Ar I Пх10 Х Х 3 ?, 23 Agu 2013 ... Lead sulfide is an inorganic compound with the chemical formula PbS. It is also known as galena, which is the principal ore and important ..., Sulfides - pyrite (FeS 2), galena (PbS) Oxides - hematite, limonite (iron oxides) Halides - rock salt or halite, fluorite. Carbonates - calcite, dolomite. Sulfates - gypsum, anhydrite. Silicates - quartz, biotite, K-feldspar, plagioclase, pyroxene, amphibole . Chemical Composition of Minerals. Many minerals have a precise chemical formula ..., 2.3 Mineral Groups Most minerals are made up of a cation (a positively charged ion) or several cations and an anion (a negatively charged ion (e.g., S 2–)) or an anion complex (e.g., SO 4 2–). For example, in the mineral hematite (Fe 2 O 3), the cation is Fe 3 + (iron) and the anion is O 2– (oxygen). We group minerals into classes on the basis of their …, Galena definition, a common, heavy mineral, lead sulfide, PbS, occurring in lead-gray crystals, usually cubes, and cleavable masses: the principal ore of lead. See more. , Anglesite, naturally occurring lead sulfate (PbSO4). A common secondary mineral that is a minor ore of lead, it is usually formed by the oxidation of galena and often forms a …, Colorless to white, often tinted grey, yellow, green or blue; colourless in transmitted light. Named in 1832 by Francois Sulpice Beudant for the type locality, the Parys Mine on the Island of Anglesey (Ynys Môn) in Wales, U.K. Baryte Group. Along with cerussite, the most common secondary lead mineral., Figure 10d-4: Pyrite. Figure 10d-5: Galena. The Halides are a group of minerals whose principle chemical constituents are fluorine, chlorine, iodine, and bromine. Many of them are very soluble in water. Halides also tend to have a highly ordered molecular structure and a high degree of symmetry., Sphalerite is often found with galena, a lead ore. Sphalerite is a mineral, mixed with zinc and iron sulfide. The chemical formula of Sphalerite is (Zn, Fe)S. The dispersion of sphalerite (0.156) is three times that of diamond, which has a dispersion of 0.44., Vanadinite. Vanadinite is a mineral belonging to the apatite group of phosphates, with the chemical formula Pb 5 ( V O 4) 3 Cl. It is one of the main industrial ores of the metal vanadium and a minor source of lead. A dense, brittle mineral, it is usually found in the form of red hexagonal crystals. It is an uncommon mineral, formed by the ..., Galena is very soft and has perfect cleavage. Care must be taken not to damage the crystals. The mineral will tarnish if exposed to the elements. It is a lead sulfide mineral so please wash hands after handling. This Galena gemstone guide lists qualities of the Galena gem type, including stone colors, common names, meanings, gemstone hardness ..., A self-made solid galena electrode acted as the working electrode. The chemical composition (wt.%) of the galena used in this work is: 86.33Pb, 13.61S. The ..., Summarize this article for a 10 years old. SHOW ALL QUESTIONS. Lead (II) sulfide (also spelled sulphide) is an inorganic compound with the formula Pb S. Galena is the principal ore and the most important compound of lead. It is a semiconducting material with niche uses. Lead (II) sulfide., A major and primary Lead mineral is galena (chemical formula = PbS) which comprises of 86.6% of Lead [1]. In order to smelt this mineral, a blast furnace is ..., Les minéraux entre le Big Bang et les étoiles. MinDat.org (Jolyon Ralph listings) Mineralogy Club of Antwerp, Belgium (Michael Cooper list) MinLex (Deutsch) "Mineral Lexicon". …, The most common sulfide crystalling in this manner is galena (PbS), the ore mineral of lead. A type of packing that involves two sulfide ions in each of the octahedral positions in the sodium chloride structure is the pyrite structure. This is a high-symmetry structure characteristic of the iron sulfide, pyrite (FeS 2 O). , Lead(II) sulfate, also known as plumbous sulfate, is a chemical compound. Its chemical formula is PbSO 4. It contains lead and sulfate ions. The lead is in its +2 oxidation state. Properties. Lead(II) sulfate is a white solid. It does not dissolve in water. It is toxic because it has lead in it. It does not dissolve in sulfuric acid , Chemical Formula. KAlSi3O8 – NaAlSi3O8 – CaAl2Si2O8. Streak. White. Mohs Hardness. 6-6.5. Crystal System. triclinic, monoclinic. Color. pink, white, gray, brown. Luster. Vitreous. Fracture. conchoidal, uneven. Description. Feldspar is the name given to a group of minerals distinguished by the presence of alumina and silica (SiO 2) in their ..., The first step to finding the molar mass of Galena is to count the number of each atom present in a single molecule using the chemical formula, PbS: ...