Graphite From the Treadway quarry,
Port Henry, New York

Section of a 2-mm tabular
graphite crystal with a
second-generation graphite
overgrowth, etched from calcite.
Close-up of the secondary
graphite overgrowth

Secondary overgrowths of graphite on earlier-formed graphite are interesting occurrences in graphite-bearing marbles from several localities (Weis 1980).

Reference:
P. L. Weis (1980) Graphite skeleton crystals- A newly recognized morphology of crystalline carbon in metasedimentary rocks. Geology 8, 296-297.

Photos by George W. Robinson and John A. Jaszczak

© Copyright George W. Robinson and John A. Jaszczak

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