[Rockhounds] ID help

[Pete Richards]

I'll try a different suggestion.  Could it be titanite? Alpine  
titanite is often green, sometimes light.  Some of the angles look  
right, and I imagine I see a groove in one view that might be a re- 
entrant region caused by the common contact twinning.  I don't know  
anything about fluorescence....

Pete Richards


On Jun 23, 2009, at 12:50 PM, Lawrence Rush wrote:

> I just got a box of minerals from Pakistan which contained 2 pieces  
> of an unidentified material. These are unfamiliar to me, and I need  
> some help.
>
> The color is a sea green, translucent. The crystals are well  
> formed, appear to be perhaps Tetragonal or Orthorhombic. They have  
> 4 distinct sides, diamond-shaped in cross section, with  sharp low  
> angle edges on 2 sides. The hardness is greater than 6. The matrix  
> is quartz, evidently a pegmatite mineral. No locality, but all of  
> the others from this supplier were from Afghanistan, Pakistan, and  
> Waziristan.
>
> I suspect they are Topaz, but the shape and color have me  
> questioning this.
>
> I posted photos on http://www.connroxminerals.com/temp.html
>
> Any thoughts?
>
> Thanks...Larry
>
>
>
>
> "Noel Coward thought work was more fun than play,  but he never,  
> ever worked in the mines"
>
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___________________________________
R. Peter Richards
rpr at heidelberg.edu
Morphological crystallographer





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