111-6 - GY 111 Lecture Notes D Haywick(2007-08 1 GY 111...

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GY 111 Lecture Notes D. Haywick (2007-08) 1 GY 111 Lecture Note Series Crystal Structure and Mineral Classes Lecture Goals: A) Mineral Classes B) The silicates Reference: Press et al. (2003), Chapter 3; Grotzinger et al. (2007) Chapter 3 A) Mineral classes If this were a class in mineralogy, we would be spending a few weeks discussing the way minerals are classified by geologists. Since it is not, we'll spend about 15 minutes. Most minerals are classified according to their chemical compositions, specifically the anionic components of their formulas. The one exception are native elements such as gold, silver etc. Geologists recognize 8 classes of minerals based upon the composition of the anion that characterizes them. Class Name Anion(s) Examples Dominant Bond I Native Elements none Metals: Gold, Copper, Silver Semi-metals: Arsenic (As) Non-metals: diamond, graphite, sulfur Metallic II Sulfides S - Pyrite, Chalcopyrite, Galena Covalent III Oxides\hydroxides O 2- OH - hematite, magnetite, limonite IV Halides Cl - , Fl - halite, fluorite V Carbonates CO 3 2- calcite, aragonite, malachite VI Sulfates SO 4 2- gypsum, anhydrite VII Phosphates PO 4 3- apatite VIII Silicates SiO 4 4- >3000 (i.e., most minerals) Largely Ionic The way that minerals are classified is rather good for geologists interested in economics or, as I
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This note was uploaded on 02/04/2012 for the course GLY 111 taught by Professor Haywick during the Fall '11 term at S. Alabama.

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111-6 - GY 111 Lecture Notes D Haywick(2007-08 1 GY 111...

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