Rocks and Minerals Test 2 notes - Classification I Native...

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Classification I. Native Elements: Occur in natural environments (found in pure forms) Au, Cu, Ag, Pt, Fe C (graphite/diamond) (example of polymorphs) S, As, Bi, Sb 1848 Oil minerals (Industrial Revolution) II. Sulfides (sulphides) Pyrite FeS 2 Isometric Marcasite FeS 2 Orthorhombic Galena PbS Sphalerite ZnS Chalcopyrite CuFeS 2 Bornite Cu 5 FeS 4 (peacock ore) Chalcocite CuS Cinnabar HgS Arcenopyrite FeAsS III. Halides (compounds of the halogens) Halite NaCl Sylvite KCl (important because of fertilizer) i. Not to be confused with Sylvanite AuTe 2 which was named after Telluride, CO Fluorite CaF 2 (fluorspar) IV. Oxides Corundum Al 2 O 3 (Sapphire and Rubies) Hematite Fe 2 O 3 i. Massive ii. Oolitic iii. Specularite Ilmenite FeTiO 3 (black streak) Magnetite Fe 3 O 4 (spinels) Fe 2+ O Fe 2 3+ O 3 Octahedra Chromite CrFe 2 O 4 AKA FeO.Cr 2 O 3 Octahedra (brown streak) Spinel MgAl 2 O 4 AKA MgO.Al 2 O 3 Rutile TiO 2 Pyrolusite MuO 2 Casiterite SnO 2 Uraninite UO 2 i. Uranium is easily oxidized U 4+ U 6+ found in old conglomerates and supports that early Earth lacked oxygen Columbite (Fe, Mn) Nb 2 O 6 Tantalite (Fe, Mn) Ta 2 O 6 V. Hydroxides Brucite Mg(OH) 2 Gibbsite Al(OH) 3 VI. Carbonates Polymorphs Look the same Super Alloys called Coltans found mostly in the Congo and used for micro electronics Ore Minerals
Calcite

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