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Posted in response to confused about goethite and pyrite from David Woo on December 29, 2007 at 10:56:56:

Re: confused about goethite and pyrite

Dear David;
Tell your friends that I have MANY specimens of goethite (a fancy mineral name for "rust") & pyrite; HOWEVER, the botryoidal form (rounded formations) is MUCH rarer to find w/pyrite. I'll make a guess that you have hematite, which is FAR more common to be associated with pyrite & be in botryoidal form; the mines in England produced THOUSANDS of such specimens, as well as having calcite & quartz, too. Goethire has water in it's composition, which makes it a little tough for GOOD pyrite crystals to be around in decent shape; hematite is just iron & oxygen, which pyrites cn easily handle. Goethite in the botryoidal formation means water changed some iron mineral somewhere else to goethite in solution, which carried to to where it settled & formed; this implies that the water was sitting at that one spot for QUITE a while. Since LOTS of water is NO friend to pyrites & ESPECIALLY SITTING water, that is why this isn't likely what you have.
Hope this helps.
Your friend, Steve

From Steve G. - December 30, 2007 at 11:46:52
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Message: 65776

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