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Pakistan Unknown

Posted by Steve Hardinger  
avatar Pakistan Unknown
April 06, 2012 04:38AM
At first I labeled this as epidote/clinozoisite, but doubted it later, because the striations are perpendicular to the long axis of the crystal.

The crystals are brown, transparent, and glassy. Hardness > glass. The only locality info I have is Pakistan. The matrix is quartz, and there appears to be a small hematite crystal present as well.

Any ideas about identity?
Attachments:
open | download - 14981a.JPG (383.1 KB)
open | download - 14981b.JPG (373.3 KB)
open | download - 14981c.JPG (340 KB)
avatar Re: Pakistan Unknown
April 06, 2012 04:39AM
Another picture...
Attachments:
open | download - 14981d.JPG (237.8 KB)
avatar Re: Pakistan Unknown
April 06, 2012 05:26AM
Possibly tantalite-Mn, but the form is quite unusual?

Regards,
Ralph
avatar Re: Pakistan Unknown
April 06, 2012 05:55AM
I thought about tantalite but the terminations and striations seem wrong.
avatar Re: Pakistan Unknown
April 06, 2012 06:06AM
    
I know the hardness doesn't fit and this is probably way off, but they remind me of xenotimes from Brazil?

regards,
stephaniesmiling smiley
Re: Pakistan Unknown
April 06, 2012 09:21AM
    
looks like cassiterite or similar tetragonal minerals (zircon, xenotime)
Re: Pakistan Unknown
April 06, 2012 09:25AM
    
I'd agree with Stephanie.
avatar Re: Pakistan Unknown
April 06, 2012 10:05AM
    
Vesuvianite ?
Re: Pakistan Unknown
April 06, 2012 10:06AM
That's a very nice Mangano-Tantalite. You don't see them too often with this high luster. fine specimen.

Peter
avatar Re: Pakistan Unknown
April 06, 2012 12:25PM
yes box - tantalite!
avatar Re: Pakistan Unknown
April 06, 2012 02:45PM
Thanks for the suggestions. I'll do more tests, with these candidates in mind. In the end I'll probably submit it for XRD.
avatar Re: Pakistan Unknown
April 06, 2012 04:05PM
    
Hi Steve,

Alot of good suggestions. I think it may be either Zircon or Xenotime. Have you checked for fluorescence or radioactivity, these tests may be diagnostic for this. BTW, it's a beautiful specimen, good luck with it.

Ron
Re: Pakistan Unknown
April 06, 2012 04:28PM
The striations, terminations and crystal form look just like a couple of wodginite specimens I have. These striations are located on the A axis and 100 face of wodginite crystals.
Re: Pakistan Unknown
April 06, 2012 07:06PM
    
How were these wodginite specimens analysed?
avatar Re: Pakistan Unknown
April 07, 2012 04:03AM
The specimen is not radioactive, and has no fluorescence under either SW or LW UV.
Re: Pakistan Unknown
April 07, 2012 05:52AM
looks like Zaqi Mountain, Northern areas Xenotime.
avatar Re: Pakistan Unknown
April 07, 2012 06:57AM
Hal, I don't think so. The color of my specimen is too dark (too brown; not yellowish).
Re: Pakistan Unknown
April 07, 2012 11:08PM
Xenotime will show a perfect prismatic cleavage
avatar Re: Pakistan Unknown
April 12, 2012 07:48PM
Thanks to John Attard of Attard's Minerals (http://attminerals.com/) for confirming that this is tantalite-(Mn).
avatar Re: Pakistan Unknown
April 12, 2012 09:30PM
Congratulations to Ralph, Peter and Johan!

Josele
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