302-pp12 - UNIVERSITY OF SOUTH ALABAMA GY 302:...

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GY 302: Crystallography & Mineralogy GY 302: Crystallography & Mineralogy UNIVERSITY OF SOUTH ALABAMA Lecture 12: Oxides and Hydroxides Part 1 Lecture 12: Oxides and Hydroxides Part 1
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Last Time Sulfides and Sulfosalts 1. Properties of more sulfides/sulfosalts 2. Economics (resources, reserves, extraction) Featured minerals: Molybdenite, Cinnabar
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Molybdenite (MoS 2 ) Crystal: Hexagonal Pt. Group: 6/m 2/m 2/m Habit: hexagonal plates, scales SG: 4.7 H: 1-1.5 L: metallic Col: silver to lead grey Str: green-grey Clev: perfect basal (001) Name derivation: from the Greek molybdos meaning “lead” Sulfide Minerals
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Cinnabar (HgS) Crystal: Hexagonal (trigonal) Pt. Group: 32 Habit: massive, rarely rhombohedral SG: 8.1 H: 2.5 L: dull to adamantine Col: scarlet red Str: scarlet Clev: perfect (100) Name derivation: from the Persian zinjifrah meaning red resin Sulfide Minerals
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Cinnabar Mineralization http://www.idm.gov.vn/nguon_luc /Xuat_ban/2004/B23/b49.jpg
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Mining (Copper) City of Butte Berkley Pit (1 mile wide, 900 feet deep)
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Molybdenite Emplacement The current owners (Phillips Dodge) are doing environmental work on the mine, the tailings and the surrounding area.
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Sulfide Refining Extraction Processing Blasting Extraction Transport Crushing Concentration Slurried Smelting Roasting in an oxidizing furnace CuFeS 2 (1%) CuFeS 2 (30%) CuO + slag + SO 2 Cu + slag + SO 2 Conversion Roasting in an reducing furnace Blister Copper Fire Refining Final removal of S and O Electrolysis 99% pure Cu
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Today’s Agenda Oxides and Hydroxides 1. Properties of select minerals 2. The chemistry of oxides/hydroxides 3. Banded Iron Formation Featured minerals: Iron
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Oxides
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Oxides •Oxides involve a strong ionic bond between metal cations and O 2- .
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Oxides •Oxides involve a strong Ionic bond between metal cations and O 2- . •Classification is done on the basis of valancy (AX types). A
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302-pp12 - UNIVERSITY OF SOUTH ALABAMA GY 302:...

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