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Nesosilicates |
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pyrope |
Mg3Al2Si3O12 |
1) eclogites and high pressure mafic and
ultramafic rocks |
olivine, pyroxene, spinel, occasionally diamond |
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Omphacite is a bright green pyroxene that is
commonly found with pyrope in eclogites. |
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Inosilicates |
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glaucophane |
Na,
Mg, Fe2+, Fe3+ clinoamphibole |
1) blueschist facies metamorphic rocks |
jadeite, lawsonite, aragonite |
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Riebeckite is a darker and more Fe rich species
related to glaucophane, and can be found in certain granites. |
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Tectosilicates |
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Stishovite
and coesite
high pressure polymorphs of silica; coesite is found in a few high pressure
metamorphic environments, in a few xenoliths, and both may be present at
sites of meteorite impacts |
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