Olivine Basalt Porphyry (R1837)
Item
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Title
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Olivine Basalt Porphyry (R1837)
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Description
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Valmont, Boulder County, Colorado
Eocene age
MegaL Handsample is a black fine-grained, porphyritic and slightly vesicular rock with phenocrysts of augite and olivine in a fine crystalline groundmass.
Micro: Thin Section has pale green augite, olivine and thing subparallel calic plagioclase laths. The matrix is poorly oriented aggregate of small plagioclase laths, grains of augite, olivine, magnetite and accessory biotite and apatite.
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Creator
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Dustin Morris
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Source
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Wards Collection
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Publisher
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Lafayette College
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Contributor
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Tamara Carley
