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Unstable pyrite
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Jordi Fabre
Overall coordinator of the Forum

Joined: 07 Aug 2006
Posts: 5111
Location: Barcelona

Posted: Nov 14, 2019 09:19 Post subject: Re: Unstable pyrite

John Jaszczak wrote:

I have several miniature and smaller Merelani pyrites in my collection, and have also photographed some loose larger and very lustrous crystals. Several of the miniature and smaller samples I have are on some matrix so are quite interesting. Most of them show what I would call natural fractures- natural because the matrix holds the broken pieces together with matrix in between. Some also show partially broken crystals with matrix right on the fracture surface. I should try to photograph some.

Some of the matrix pieces are on damaged drusy graphite, and others are on drusy calcite. Clearly the calcite crystal associated pieces are not acid treated, and I don't think the graphite matrix samples are acid treated to dissolve the calcite, though I have seen other specimens that came fairly directly from the mines that were clearly acid treated to dissolve calcite (and on one piece, ruin a blue apatite crystal). For the loose crystals I don't know if they might have been broken out of, or dissolved out of calcite.

I have been wondering about the stability of Merelani pyrite and so was interested (and sorry) to see John's broken piece. So far after 4 or 5 years, my crystals don't seem to show any pyrite disease.

Thanks John, very enlightening!

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