Joined: Thu Jul 12, 2012 4:47 am Posts: 20 Location: Austria
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?
Post subject: Re: inclusion quartz - shows biaxial
Posted: Sat Apr 28, 2018 12:58 pm
Established Member
Joined: Thu Jul 12, 2012 4:47 am Posts: 20 Location: Austria
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.
Post subject: Re: inclusion quartz - shows biaxial
Posted: Mon Apr 30, 2018 6:47 am
Gold Member
Joined: Wed Jan 23, 2013 5:29 pm Posts: 1047 Location: Paris
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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