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 Post subject: Dark Blue Beryl from Pakistan
PostPosted: Sat Oct 26, 2019 12:26 pm 
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Dr. Rossman and Brendan Laurs recently reported on unusual dark blue beryl from Pakistan:
Gem-A Volume 36, No.7 wrote:
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 Post subject: Re: Dark Blue Beryl from Pakistan
PostPosted: Sat Oct 26, 2019 12:56 pm 
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I saw a few samples of this at Tucson this year. They were calling it a color change beryl because of strong pleochroism (green through the side). Really impressive stuff, though certainly not cheap.

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 Post subject: Re: Dark Blue Beryl from Pakistan
PostPosted: Sat Oct 26, 2019 2:18 pm 
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Meg Berry purchased some in Tucson and provided George Rossman with some samples for analysis.
It was determined that the blue beryl is very rich in iron: Fe 2.5-3.6 weight %. In addition to iron, relatively high levels of Cs (1.5-2.3 wt.%). In addition traces of Mn, Rb, S, Zn, Cu, Ga, Ni and V.

I would like to read a report on the geology of the area in which this beryl was found.
Shengus-Dassu and Chumar Bakhoor areas of the Gilgit-Baltistan.

Say those locals 3 times fast.


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 Post subject: Re: Dark Blue Beryl from Pakistan
PostPosted: Tue Nov 12, 2019 7:59 pm 
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That's an absolutely ridiculous amount of Fe and Cs.


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 Post subject: Re: Dark Blue Beryl from Pakistan
PostPosted: Tue Nov 12, 2019 10:53 pm 
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Agreed.


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 Post subject: Re: Dark Blue Beryl from Pakistan
PostPosted: Tue Nov 12, 2019 11:25 pm 
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The iron is very high, but high Cs beryl isn't super super unusual. Pezzottaite is around 14 wt% so there is still a fair amount of wiggle room there. I wonder if any of the other elements are helping the color along? Probably not, but it is pretty impressive looking stuff

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