302-pp16 - UNIVERSITY OF SOUTH ALABAMA GY 302...

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GY 302: Crystallography & Mineralogy GY 302: Crystallography & Mineralogy UNIVERSITY OF SOUTH ALABAMA Lecture 16: Sulfates and Phosphates (Class VI and VII Minerals) Lecture 16: Sulfates and Phosphates (Class VI and VII Minerals)
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Last time (before the test) Carbonates, Nitrates, Borates 1. Select carbonate minerals 2. Sphalerite and galena (left over sulfides) Featured mineral association: MVT-ores (Mississippi Valley-type ores)
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Carbonates, Nitrates, Borates •There are 70 carbonate minerals, over 60 borates and a few nitrates •All 3 types of minerals involve planar anion groups…. •… with the exception of BO 4 4- which is tetrahedral •Oxygen atoms are strongly covalently bonded in the anion (especially in CO 3 2- ), but bonding between the anion and the cation is ionic
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Carbonates Calcite Group (3 2/m) : Calcite (CaCO 3 ) Magnesite (MgCO 3 ) Siderite (FeCO 3 ) Rhodochrosite (MnCO 3 ) Smithsonite (ZnCO 3 ) Dolomite Group (3) : Dolomite (CaMg(CO 3 ) 2 ) Ankerite (CaFe(CO 3 ) 2 ) Kutnahurite (CaMn(CO 3 ) 2 ) Zincian Dolomite (CaZn(CO 3 ) 2 )
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Carbonates Calcite Group (3 2/m) : Calcite (CaCO 3 ) Magnesite (MgCO 3 ) Siderite (FeCO 3 ) Rhodochrosite (MnCO 3 ) Smithsonite (ZnCO 3 ) Aragonite Group (2/m 2/m 2/m) : Aragonite (CaCO 3 ) Witherite (BaCO 3 ) Strontianite (SrCO 3 ) Cerussite (PbCO 3 )
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Aragonite (CaCO 3 ) Crystal: Orthorhombic (pseudo hexagonal) Pt. Group: 2/m 2/m 2/m Habit: euhedral, hexagonal prisms SG: 2.94; H: 3.5-4 L: vitreous; Str: white Col: colourless (pinkish) Clev: poor{010}, {110} Optics: Biaxial - n α = 1.530; n β = 1.682; n γ = 1.686 Name derivation: From its type location, Aragon in Spain Carbonate Minerals
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MVT-ores Mississippi Valley-type ore deposits •Named after the type mines in Missouri, Tennessee and other sites in the Mississippi Valley •Low temperature (epithermal) sedimentary ore deposits •Primary minerals produced: dolomite (saddle), calcite, fluorite and some old friends….
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Today’s Agenda Sulfates and Phosphates 1. Class VI Minerals: Sulfates, Chromates, Molybdates, Tungstates 2. Class VII Minerals: Phosphates, Arsenates and Vanadates 3. Economics of Class VII minerals
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Sulfates etc.
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This note was uploaded on 02/05/2012 for the course GLY 302 taught by Professor Staff during the Spring '11 term at S. Alabama.

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302-pp16 - UNIVERSITY OF SOUTH ALABAMA GY 302...

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