Mineralogy - Chapter 4
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Mineral midterm
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8 Terms
1
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define polymorphism
same chemical composition, different crystal structures (diamond and graphite)
2
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define pseudomorphs
one mineral replaces another’s structure but keeps its external shape
3
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define displacive polymorphism
minor shifts
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define reconstructive polymorphism:
bonds broken/reformed (graphite to diamond)
5
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define order-disorder polymorphism
cation arrangement changes (sanidine to microcline)
6
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define quenchable reactions
displacive = reversible; reconstructive = irreversible
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disorder polymorphism vs. exsolution
disorder: random cation distribution; exsolution: phase separation into distinct domains
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Metamict minerals
radiation damage destroys crystal structure; amorphous, poor cleavage, glassy texture
Note 
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