Fig. 3. Graphite from Lime Crest quarry, Sparta, New Jersey

Unusual Graphite Crystals
from Lime Crest quarry, Sparta, New Jersey

Fig. 3.

Idealized graphite crystal showing a growth
twin that is visible as a small triangular
protrusion from the basal pinacoid face.
The most common twin law for growth twins
is by reflection and contact
on the {11-21} plane.


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