February 26th - February 26th C Silicate Minerals 1 Need...

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February 26 th C. Silicate Minerals 1. Need abundant elements/opposite charges. a. Si +4  and O +2   b. All silicate minerals contain the Si-O tetrahedron (4 sides) c. Only Si and O d. Tightest packing of O atoms around a Si atom e. -4 charge on tetrahedron f. Must neutralize charge, so: ~ Link up oxygen’s ~ Add other (+) ions ~ Or both 4) Examples (Silicates) A. Quartz 1. Very common 2. Si and O 3. Used to make glass 4. Many varieties, including amethyst and Herkimer Diamond B. Feldspars 1. Plagioclase or orthoclase 2. Most important (by volume) family of minerals within silicate family 3. Si and O , plus Al and Ca, Na, or K 4. Important geologically, but not useful economically C. Clay mineral family 1. ~30; tiny crystals 2. Common near the surface of the Earth 3. Formed by weathering of feldspars 4. Especially common in muddy sediments, shale, and mudstone 5. Si and O in sheets; plus Al and a few other elements 6. Mud, ceramics, paper, cement D. Non-silicates 1. Native minerals 2. Metallic minerals, only one element
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3. Au, Ag, platinum, copper
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This note was uploaded on 04/30/2008 for the course GEOL 120 taught by Professor Maglouihlin during the Spring '08 term at Colorado State.

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February 26th - February 26th C Silicate Minerals 1 Need...

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