[Rockhounds] Terlingua-type calcite

[Axel Emmermann]

Don H wrote:

> is bound.  In addition, some color effects are anisotropic, 
> which means they are dependent upon the orientation of the 
> material relative to the light entering it.  Most people know 
> this as "pleochroism" or "dichroism", among other terms.
> 

I have some nice pics of anisotopic effects in fluorescence.
I'm not sure if I sent them before..I'll send you som off list.

Cheers
Axel