111-pp6(1) - UNIVERSITY OF SOUTH ALABAMA Quiz...

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1 Quiz Three (9:30-9:35 AM) GY 111: Physical Geology GY 111: Physical Geology UNIVERSITY OF SOUTH ALABAMA Lecture 6: Plate Tectonics and Volcanism Lecture 6: Plate Tectonics and Volcanism Lecture 6: Plate Tectonics and Volcanism Last Time 1. Crystal Chemistry (Crystallography) 2. Mineral Classification (8 classes) 3. The Silicates (7 sub-classes) Web notes 5 Crystal Structures: CaF 2 (Fluorite) { -Ca 2+ { -F - Source: http:\\staff.aist.go.jp At last count, there are well over 4000 distinct minerals minerals” in our solar system in our solar system They are composed of 90+ elements, as well as more complex ions like CO complex ions like CO 3 2- , SO 4 2- , PO 4 3- etc. Why classify minerals? >3000 (i.e., most minerals) SiO 4 4- Silicates VIII apatite PO 4 3- Phosphates VII gypsum, anhydrite SO 4 2- Sulfates VI calcite, aragonite, malachite CO 3 2- Carbonates V halite, fluorite halite, fluorite Cl Cl - , Fl , Fl - Halides Halides IV IV Largely Ionic hematite, magnetite, limonite O 2- OH - Oxides Oxides\ hydroxides III Covalent Covalent Pyrite, Chalcopyrite, Galena S - Sulfides II Metallic Metals: Gold, Copper, Silver Semi Semi- metals: Arsenic (As) metals: Arsenic (As) Non Non- metals: diamond, graphite, sulfur metals: diamond, graphite, sulfur none Native Elements I Dominant Bond Examples Anion(s Anion(s) Name Name Class Mineral Classification
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2 SiO 4 4- The basic silicate tetrahedra Silicate Classification The basic silicate tetrahedra (ball and stick) Silicate Classification
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