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hbi31




Joined: 26 Feb 2018
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PostPosted: Mar 01, 2018 02:35    Post subject: Problem?  

Recently, I received this sample labeled as peridot from Sapat Gali, Pakistan.
The crystal shape is not the usual prism with more or less modified terminations from this locality. It reminds me of adularia but the acute angles of the rhomb are more acute than those of adularia.
Two tests have convinced me that it is actually peridot:
- the material is slightly magnetic, as are other samples of peridot from Sapat Gali in my collection (which means that it is not pure forsterite but forsterite - fayalite series)
- Under UV (long and short wave) the material is absolutely inert, unlike the adularia samples from this region, which usually show a distinct reddish fluorescence under short wave.
Any comment will be very welcome.
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Riccardo Modanesi




Joined: 07 Nov 2011
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PostPosted: Mar 01, 2018 04:19    Post subject: Re: Problem ?  

Hi hb31!
i) if you send us some photos of your specimen, we can help you much better!
ii) see also the inclusions by microscope. Peridot contains normally some dark mineral inclusions (hornblende).
Greetings from Italy by Riccardo.

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Hi! I'm a collector of minerals since 1973 and a gemmologist. On Summer I always visit mines and quarries all over Europe looking for minerals! Ok, there is time to tell you much much more! Greetings from Italy by Riccardo.
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John S. White
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PostPosted: Mar 01, 2018 06:17    Post subject: Re: Problem ?  

I fear that the writer is confusing the name adularia with some other mineral. Adularia is a feldspar and does not in any way resemble peridot. The two could not possibly be mistaken, one for the other. Photographs?
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