Pseudohexagonal Chalcocite Crystals
Collection
John Betts - Fine Minerals
Description
Pseudohexagonal
crystals of black Chalcocite with secondary faces around the edges of the
termination
. The hexagonal appearance is due to
twinning
of
monoclinic
crystals. The largest crystal is
doubly terminated
. No damage. Ex. W. Severance collection #90.42; ex. Paul Lowe.
Locality
Geevor Mine, No. 9 Pig Lode, St. Just, Cornwall, England
Dimensions
12 x 12 x 9 mm.
Photograph
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