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Stone Mania
Joined: 06 Oct 2016
Posts: 43
Location: London
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Posted: Aug 05, 2021 11:57 Post subject: Crystal Habit of this Pyrite Mineral |
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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
Mineral: | Pyrite |
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5053 Time(s) |
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Carles Millan
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Joined: 05 May 2007
Posts: 1474
Location: Catalonia
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Posted: Aug 05, 2021 12:06 Post subject: Re: Crystal Habit of this Pyrite Mineral |
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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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Joined: 30 Jan 2008
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Posted: Aug 05, 2021 12:25 Post subject: Re: Crystal Habit of this Pyrite Mineral |
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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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Joined: 30 Jul 2007
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Location: Denver, Colorado
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Posted: Aug 05, 2021 12:34 Post subject: Re: Crystal Habit of this Pyrite Mineral |
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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
Joined: 06 Oct 2016
Posts: 43
Location: London
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Posted: Aug 05, 2021 12:38 Post subject: Re: Crystal Habit of this Pyrite Mineral |
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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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Joined: 30 Jan 2008
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Posted: Aug 05, 2021 12:41 Post subject: Re: Crystal Habit of this Pyrite Mineral |
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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
Joined: 06 Oct 2016
Posts: 43
Location: London
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Posted: Aug 05, 2021 12:43 Post subject: Re: Crystal Habit of this Pyrite Mineral |
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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
Joined: 06 Oct 2016
Posts: 43
Location: London
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Posted: Aug 05, 2021 12:43 Post subject: Re: Crystal Habit of this Pyrite Mineral |
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Thanks Alfredo, appreciate the info.
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