R1840: Pyroxenite
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Title
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R1840: Pyroxenite
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Description
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R1840
Name: Pyroxenite
Location: Nye, Montana
Geologic Age: Precambrian
Geologic name: Stillwater complex
Megascopic Description: A dark gray rock with a most commonly rough granular texture. It is largely composed of orthopyroxene (bronzite) and has a glassy appearance.
Microscopic Description: The rounded olivine is criss-crossed by thin brownish serpentine veinlets. Anhedral enstatite show fine grating exsolution structure vienlets. Interstitial anhedral calcic plagioclase and clumps of subrounded chromite grains are accessories. Small amounts of clinopyroxene may be present in some sections.
