U.S. Geological Survey Open-File Report 03-221
A Pictorial Survey of the Bedrock Beneath Western Cape
Cod, Massachusetts
![]() A large rhombohedral sphene porphyroclast in felsic gneiss (82MW0012) is mainly dissolved to grow biotite and epidote. Note biotite and muscovite partially rimming the sphene grain. Click here for a zip file with full resolution image. bt: biotite |
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