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

Thin Section of 80MW0012

Photomicrograph of Orthogneiss

Orthogneiss showing severe alteration of plagioclase to sericite and sausserite (fine grained epidote). Euhedral rhomboid-shaped sphene grain may be of a secondary growth.

Orthogneiss (80MW0012) showing severe alteration of plagioclase to sericite and sausserite (fine grained epidote). Euhedral rhomboid-shaped sphene grain may be of a secondary growth. Click here for a zip file with full resolution image.

bt: biotite
ep: epidote
pl: plagioclase
qtz: quartz
ser: sericite
sph: sphene

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