[Rockhounds] Calcite

[John Siebel]

I'll let you guys fight it out! This one has the whole ROYGBIV.

John

----- Original Message ----- 
From: "Kreigh Tomaszewski" <Kreigh at tomaszewski.net>
To: "Rockhounds at drizzle.com: A mailing list for rock and gem collectors" 
<rockhounds at lists.drizzle.com>
Sent: Monday, December 08, 2008 8:15 PM
Subject: Re: [Rockhounds] Calcite


>I wish I had said that. ;-}
>
> I have some "Christmas Calcite" that has alternating red and green stripes 
> visible on some surfaces. I understand it is due to sub-surface cracks, 
> with lightwave length gaps, that produce interference, much like oil 
> slicks on water.
>
> Kreigh
> On Monday, Dec 8, 2008, at 07:02 America/Detroit, William Dicks wrote:
>
>> John:
>>     You could label it with my name and address and ship it "overnight
>> express"!!!!:-))
>>
>>>>> john at pandemoniumgraphics.com 12/06/08 6:56 PM >>>
>> I've got a handsome calcite on stilbite from Coffin Butte, OR (one of
>> many).
>> In the proper light it shows a rainbow. How should I label it? I'm
>> thinking
>> prismatic perhaps?
>>
>> John
> http://www.eclecticlapidary.com/Rockhounds/index.html