U.S. Geological Survey Open-File Report 03-221
A Pictorial Survey of the Bedrock Beneath Western Cape Cod, Massachusetts

Thin Section of 81MW0005

Photomicrograph of Amphibolite

Intergrown biotite and hornblende grains in a matrix of altered plagioclase and quartz in an unfoliated amphibolite. Tiny, high relief grains in the matrix are mainly sausserite (epidote) and some sericite.

Intergrown biotite and hornblende grains in a matrix of altered plagioclase and quartz in an unfoliated amphibolite (81MW0005). Tiny, high relief grains in the matrix are mainly sausserite (epidote) and some sericite. Click here for a zip file with full resolution image.

bt: biotite
hbl: hornblende
pl: plagioclase
qtz: quartz

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