December 14-16—SAN DIEGO, CALIFORNIA: Wholesale and retail show; Gem Faire Inc.; Scottish Rite Center, 1895 Camino del Rio S; Fri. 12-6, Sat. 10-6, Sun. 10-5
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 Post subject: inclusion quartz - shows biaxial
PostPosted: Sun Apr 22, 2018 2:12 pm 
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I have two faceted inclusion quartz (petrol-quartz), which show biaxial at the refractometer. Is there already literature about it? I'm thinking of a special kind of twinning, maybe?

Sigi


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 Post subject: Re: inclusion quartz - shows biaxial
PostPosted: Fri Apr 27, 2018 8:20 am 
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Why do you say they show biaxial at the refractometer ? What readings do you get ?


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 Post subject: Re: inclusion quartz - shows biaxial
PostPosted: Fri Apr 27, 2018 9:55 pm 
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Sigi, I too suspect you are misreading what the refractometer is telling you.


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 Post subject: Re: inclusion quartz - shows biaxial
PostPosted: Sat Apr 28, 2018 12:58 pm 
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I can also understand your doubts about a wrong reading on the refractometer. I also do not say that these crystals are biaxial, they just show themselves that way.
My guess is a special twinning.
Meanwhile, two rough stones with a special twinning are on the way.


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 Post subject: Re: inclusion quartz - shows biaxial
PostPosted: Sun Apr 29, 2018 10:01 pm 
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Take some pictures AND directly post you refractometer results.


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 Post subject: Re: inclusion quartz - shows biaxial
PostPosted: Mon Apr 30, 2018 6:47 am 
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I don't think that any twinning could distort the readings on a refractometer.
Most of the time the reader or the interpretation is what distorts.
Unless it isn't quartz, of course.


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