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 Post subject: crystal quartz with unusual form
PostPosted: Mon Jul 26, 2021 8:36 am 
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Location: iran
hi everyone.
this is crystal quartz (skeleton) and it seems looklike monoclinic system.
why it form like this?


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 Post subject: Re: crystal quartz with unusual form
PostPosted: Mon Jul 26, 2021 9:42 pm 
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Joined: Sun Oct 16, 2005 12:22 pm
Posts: 21049
Location: San Francisco
Quartz xls can take on a number of different habits:
https://www.mindat.org/g/822


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 Post subject: Re: crystal quartz with unusual form
PostPosted: Mon Jul 26, 2021 10:17 pm 
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Location: San Marcos, CA
These can be fun. Double terminations, irises, phantoms and that last one looks like it may have petroleum inclusions. Check it for fluorescence. Your samples from where do you know?

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 Post subject: Re: crystal quartz with unusual form
PostPosted: Tue Jul 27, 2021 7:17 am 
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Location: iran
glhays wrote:
These can be fun. Double terminations, irises, phantoms and that last one looks like it may have petroleum inclusions. Check it for fluorescence. Your samples from where do you know?


Thank you for your attention, this is from Iran / Nehbandan ‌ (near the Afghan border). I bought about 9 kg of skeletal quartz / each with interesting shapes for only $ 150. this one is very unique shape.

here is a nother special crystal. most of trigonic quartz are etch in surface. but this is under surface and large trigon:


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