Nomarski (NDIC) image of plagioclase phenocryst and groundmass from 1985 lava flow of Arenal volcano, Costa Rica; phenocryst is 300 ºm in length (M. Streck). Originally uploaded in Cutting Edge:Petrology.
Image 13656 is a 3110 by 4219 pixel JPEG Uploaded:
Provenance Dave Mogk, Montana State University-Bozeman
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