Insoluble residues from Precambrian graphitic marble from New York and Montana contain incomplete graphite crystals as well as the more abundant dense, lustrous hexagonal flakes. Skeleton forms have a lower order of crystallinity and contain less 13C than the lustrous flakes. Distribution of the two forms indicates small-scale disequilibrium despite the high metamorphic rank of the host rock.

This content is PDF only. Please click on the PDF icon to access.

First Page Preview

First page PDF preview
You do not have access to this content, please speak to your institutional administrator if you feel you should have access.