[Rockhounds] Terlingua-type calcite

[Axel Emmermann]

Immediately. ;-))) 

> -----Oorspronkelijk bericht-----
> Van: rockhounds-bounces at lists.drizzle.com 
> [mailto:rockhounds-bounces at lists.drizzle.com] Namens pmodreski at aol.com
> Verzonden: maandag 14 juli 2008 17:54
> Aan: rockhounds at lists.drizzle.com
> Onderwerp: Re: [Rockhounds] Terlingua-type calcite
> 
> Axel,
> 
> I'd enjoy receiving those too, if you don't mind.? (Don't 
> remember if I have seen those pictures of yours before, or not.)
> 
> I'm curious as to how visible this phenomenon really is--and 
> that it is truly anisotropic fluorescence that one is seeing, 
> and not just an artifact of irregular shape or transparency 
> of the specimen (you know me, always the skeptic!).
> 
> Thank you,
> Pete
> 
> 
> -----Original Message-----
> From: Axel Emmermann <axel.emmermann at pandora.be>
> To: 'Rockhounds at drizzle.com: A mailing list for rock and gem 
> collectors' <rockhounds at lists.drizzle.com>
> Sent: Mon, 14 Jul 2008 10:42 am
> Subject: RE: [Rockhounds] Terlingua-type calcite
> 
> 
> 
> 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 
> 
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