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Posted in response to Re: huge slightly yellow orthoclase cut stone from Mike Gramlich on March 14, 2012 at 00:29:09:

Re: Re: huge slightly yellow orthoclase cut stone

Mike:

I have spent a great deal of time over the last year searching the internet to accumulate info about the stone my wife found.
We were working in an old mica mine(prospect) that never produced much mica. Also, it seems to be a pegmatite that produces only malformed crystals. I have never found a good quartz crystal at this mine. One day my wife was scratching around and found what we thought was something that was unusually clear. It turned turned out to be about 450 carats.

We have used two different systems to get the specific gravity. Every time it comes up about 6.0.
Orthoclase seemed to be the closest mineral. It does not have any reflectance like andularia.

Very small stones are dirt cheap on ebay so I just forgot about it. About 1 year later I saw a much large stone like this listed for pretty big bucks.

I determined that this stone was so clear that I mailed it off to Thailand and had it cut and faceted. It is a very nice piece and the guy that cut it said it was very clean. Now it weighs 190 carats.
One of the guys that responded to my post said there is very little info available for orthoclase, and I would agree.
One can find orthoclase listed in the rock books, but they always seem to be talking about the white, chalky phase which is one of the most common minerals on earth.
I don't see much of the clear phase turning up in the USA. I wanted to find out if others in the USA have found this type of stone.

From Charley Brooks - March 14, 2012 at 08:09:20
Email:

Message: 70245



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