[Rockhounds] 18 sided Beryl crystal

[Kreigh Tomaszewski]

I could not find the specimen, but I found a couple pictures (sent to Peter
off list). Mine was actually an 18 sided crystal (not 12 as I remembered).

On Tue, Mar 5, 2019 at 4:46 PM Peter Richards <rpr at heidelberg.edu> wrote:

> I may rapidly become viewed as a crystallographic curmudgeon, but I will
> report that twinning is not known in beryl.  Kreigh, can you provide more
> description and maybe a picture somewhere?
>
> Pete Richards
> ___________________________
> R. Peter Richards, Ph.D.
> rpr at heidelberg.edu
> Morphological Crystallographer
>
> > On Mar 5, 2019, at 3:31 PM, Kreigh Tomaszewski <kreigh at gmail.com> wrote:
> >
> > I have a small 12 sided crystal from the same locality that is a twinned
> > crystal, and the faces are pretty close to being even. Your's looks more
> > like a group of crystals that grew together, but not quite in the same
> axis
> > alignment.
> >
> > On Tue, Mar 5, 2019 at 2:47 PM <larryrush at att.net> wrote:
> >
> >> 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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