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GeneralNeed 'Pyrite Disease' Photos

17th Oct 2019 21:04 UTCSteve Hardinger Expert

Looking for pictures of mineral(s) suffering from advanced 'pyrite disease'. Pyrite, marcasite, pyrrhotite, etc. Examples with accompanying decomposed labels are especially desirable.

17th Oct 2019 21:56 UTCFrank K. Mazdab Manager

Hi Steve,

please don't start multiple identical threads, even in different forums.

I closed the one in the "mineral photography" forum... the one here in "general" should get plenty of views from the membership.

17th Oct 2019 22:04 UTCSteve Hardinger Expert

17th Oct 2019 23:21 UTCBob Harman

STEVE,      I usually stay away from corroding pyrites as they and related stuff doesn't  often interest me. And this might not be exactly what you are looking for, but iron stained areas in Indiana geodes, are often the end results of corroded very small pyrites.  The patchy rusty areas with fresh nearby areas and late forming hemispheric calcites help in the identification. CHEERS.......BOB

18th Oct 2019 01:25 UTCLou Rector

Galena & Pyrrhotite from Dal'negorsk that has seen better days.

18th Oct 2019 02:17 UTCDean Allum Expert

Steve,  I  have a bucket full of decayed pyrite concretions. Would you like me to send some to you?

18th Oct 2019 05:20 UTCD Mike Reinke

I've had some, that left undisturbed, grew into beautiful shapes, were wonderful under the microscope; Would make for some for some fine macrophotography.

18th Oct 2019 06:44 UTCFranz Bernhard Expert

Rotten pyrite/marcasite within upper Cretaceous, coalified wood (subbituminous rank) from Lauferwald, Styria, Austria. Took about 4 years from pristine to this stage.
Franz Bernhard

18th Oct 2019 14:12 UTCEd Clopton Expert

Here is a pyrite disk from Sparta, Illinois, that is (as an old landlady of ours used to say) "going the way of all things".  This photo was taken about two years ago.  Stay tuned . . . .

18th Oct 2019 14:13 UTCEd Clopton Expert

. . . and here it is today.  It was completely intact when purchased in 2008.

18th Oct 2019 14:15 UTCEd Clopton Expert

The white material in the center is iron sulfates mixed with crumbled pyrite.  The yellow appears to be elemental sulfur on the surface of the pyrite.

18th Oct 2019 21:34 UTCEd Clopton Expert

Here's a relatively recent and authoritative-looking article on pyrite disease:

Larkin LR.  2011.  Pyrite disease:  cause and effect, prevention and cure.  NatSCA News 21:35-43.

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