[Rockhounds] 18 sided Beryl crystal

[larryrush at att.net]

I acquired this piece many years ago, in a trade. It may be described as a
hexagonal tripyramid (?). Although it does have 18 prism faces, few are of
the same width, and the symmetry is not obvious or easily defined.  The
locality is the Mc Ginnes Mine, Wentworth, Grafton Co., NH, noted for these
unusual beryls. It is 2X3X13 cm in size, and has no terminations.

 

I got it due to its unusual habit, and would appreciate any comments that
help to define it, crystallographically.

 

 <https://www.irista.com/gallery/sdsy1wlie6l5>
https://www.irista.com/gallery/sdsy1wlie6l5 

Larry

 

Larry Rush

BS Geology

ConnRox Minerals

Guilford, CT

 



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