15 - GEO416K Scores so far Next Lecture Exam Nov 15 Next...

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12/2/10 GEO416K Scores so far… Next Lecture Exam: Nov. 15 Next Lab Exam: Dec. 1 or 2
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Click to edit Master subtitle style 12/2/10 Chp. 12: Post-Crystallization Processes in Minerals 1. Polymorphs 2. Secondary Twinning 3. Exsolution 4. Radioactivity in Minerals 5. Pseudomorphs
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12/2/10 1. Polymorp Ability of a mineral to crystallize with more than 1 type of structure
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12/2/10 isometri c hexago nal
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12/2/10 Fig. 4.16 Only diamond stable in this “field” Diamond and melt stable along this line Diamond, graphite and melt stable at this point
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12/2/10 Marcasite FeS2 (orthorhombic) Pyrite FeS2 (isometric) Calcite CaCO3 (hexagonal) Aragonite CaCO3 (orthorhombic)
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12/2/10 Fig. 4.16
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12/2/10
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12/2/10
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12/2/10 Low P, High T Quartz polymorp hs typical of volcanic rocks
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12/2/10 Very high P, (can get to high T) stishovite , coesite typical of meteorit e impacts and/or mantle rocks
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12/2/10
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12/2/10 Fig. 4.16 Common polymorphs in metamorphic rocks
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12/2/10 1. Polymorp Ability of a mineral to crystallize with more than 1 type of structure 4 types: 1. Reconstructive polymorph : •. requires bond- breaking •. (ex.) diamond - graphite •. (ex.) tridymite (volcanic quartz)- low quartz Fig. 12.2
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12/2/10 Complete rearrangment
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12/2/10 1. Polymorp Ability of a mineral to crystallize with more than 1 type of structure 4 types: 2. Displacive polymorphs no bond-breaking slight displacement of atoms (ex.) high quartz-low Fig. 12.2
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12/2/10 Slight rearrangment (twinning can occur during the rearrangement)
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12/2/10 1. Polymorp Ability of a mineral to crystallize with more than 1 type of structure 4 types: 3. Order-disorder polymorph: Perfect order: atoms occupy certain sites that are known Total disorder: equal probability of finding an atom in a specific Microcli ne Sanidine
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12/2/10 Fig.
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