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Posted in response to Re: Re: huge slightly yellow orthoclase cut stone from Charley Brooks on March 14, 2012 at 08:09:20:

Re: Re: Re: huge slightly yellow orthoclase cut stone

Well Sir,
I hate to disappoint you, but there is quite a lot of info available on orthoclase, both online and in print. If you had tried a little harder to do your home work/self research, you could have saved yourself alot of questions, and also acquired many answers very quickly.
I don't know what "systems" you used to obtain your SG, but 6.0 is off the scale. The specific gravity of orthoclase is 2.58. A simple scratch test (Streak) would have been white. Orthoclasae has prefect cleavage. If you have any of your sample left over, take a small piece and gently strike it with (preferably) a small hammer. Orthoclase has a Mohs hardness of 6. So it is soft. When you strike it it will cleave right down the middle.
I'm not sure why you would have went to the trouble to send your stone over-seas to be faceted; there are plenty of expert faceters right here in the States. But a good faceter usually facets the whole lot, so you have many stones to choose from. I don't know if that stone would be to big to fit in an appraisers refractometer, but if you have any smaller stones from the faceting you had done, take into an appraiser. If you come back with an R.I. of 1.518 to around 1.525, I'd say you probably have an orthoclase stone. Take away all the guess work and just have a full appraisal done. Then you can sleep at night. Or not?

From Mike Gramlich - March 15, 2012 at 23:26:44
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