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Crystal Habit of this Pyrite Mineral
  
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Stone Mania




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PostPosted: Aug 05, 2021 11:57    Post subject: Crystal Habit of this Pyrite Mineral  

What crystal habit does this piece of pyrite have? Would it be described as massive? Anything else you can tell me about his piece would be greatly appreciated.


Many thanks,

Laurence



pyrite-mineral-freestanding.jpg
 Mineral: Pyrite
 Description:
 Viewed:  854 Time(s)

pyrite-mineral-freestanding.jpg



pyrite-mineral-1aq.jpg
 Description:
 Viewed:  852 Time(s)

pyrite-mineral-1aq.jpg


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Carles Millan
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PostPosted: Aug 05, 2021 12:06    Post subject: Re: Crystal Habit of this Pyrite Mineral  

Stone Mania wrote:
What crystal habit does this piece of pyrite have? Would it be described as massive? Anything else you can tell me about his piece would be greatly appreciated.
Many thanks,
Laurence

This specimen is crystallized, but it doesn't show any face. So your question has no answer. For the crystals to show faces there must be some free space at the moment of growing, such as a vug or alike. But this is not the case.
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alfredo
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PostPosted: Aug 05, 2021 12:25    Post subject: Re: Crystal Habit of this Pyrite Mineral  

Also, check it with a magnet to see whether it's really pyrite, or might be pyrrhotite.
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Pete Modreski
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PostPosted: Aug 05, 2021 12:34    Post subject: Re: Crystal Habit of this Pyrite Mineral  

Yes, definitely, we'd just call it "massive".

Looks like it's criss-crossed by veins & patches of some other, dark mineral, probably some other sulfide. Could be any of a great number of things--galena, black sphalerite, bornite, molybdenite, chalcocite... and probably no easy way to tell what that might be, unless you can tell that it has good cleavage (galena or sphalerite), is very soft (molybdenite), etc.
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Stone Mania




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PostPosted: Aug 05, 2021 12:38    Post subject: Re: Crystal Habit of this Pyrite Mineral  

Thanks guys for your replies. Checked it with a magnet and can feel no magnetism at all.
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alfredo
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PostPosted: Aug 05, 2021 12:41    Post subject: Re: Crystal Habit of this Pyrite Mineral  

In that case no pyrrhotite, and probably indeed pyrite as you thought, and perhaps also including other sulphides as Pete said.
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Stone Mania




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PostPosted: Aug 05, 2021 12:43    Post subject: Re: Crystal Habit of this Pyrite Mineral  

Thanks Pete, it's definitely criss-crossed by veins of a dark mineral. Difficult to see any obvious cleavage. When I bought it I was told it was pyrite and the guy I buy from knows his stuff but I can't remember everything he told me about it. It's been locked away for some time and has only just come out to be photographed and added to my website.

Thanks again for the info, greatly appreciated.
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Stone Mania




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PostPosted: Aug 05, 2021 12:43    Post subject: Re: Crystal Habit of this Pyrite Mineral  

Thanks Alfredo, appreciate the info.
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