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PhotosPyrite - Sparta, Randolph Co., Illinois, USA
17th Apr 2013 18:05 UTCKelly Colberg
17th Apr 2013 20:03 UTCDana Slaughter 🌟 Expert
They are real and come from spoil piles at area coal mines. The coal companies don't want the pyrite (high sulfur) mixed in with the coal so the shale layers where these are found are stripped and dumped. They appear to crystallize radially from some sort of seed material (possibly fossil or organic) in horizontal layers. They have long been known from area coal mines and specimens continue to come out today. I believe Peabody Coal has reopened a mine or mines in the area. The iridescent ones that one occasionally sees are treated to produce the color and nearly all of the examples of the pyrite suns or dollars in the black shale have been reconstructed (in most cases literally constructed). I love the things!
18th Apr 2013 00:48 UTCRob Woodside 🌟 Manager
18th Apr 2013 01:08 UTCMark Heintzelman 🌟 Expert
See: http://www.mindat.org/forum.php?read,55,96471,101910#msg-101910
I have heard of some people laying claim that they have had unstable ones, including Albert Mura, a long time pyrite collector of some note. The lion share of collectors I've spoken to, myself included, have never had a problem with them after many decades of owning them. I would conclude that the odds of having one in your collection for a good long time is actually in your favor.
MRH
18th Apr 2013 01:38 UTCRob Woodside 🌟 Manager
18th Apr 2013 03:14 UTCDana Slaughter 🌟 Expert
18th Apr 2013 04:17 UTCSteve Hardinger 🌟 Expert
A typical mine-run lot needed cleaning to remove shale residue. Exacto knife and ultrasonic cleaner do a good job. Maybe 5% shattered in the cleaner. Next, I would let them sit for a few months to see if any showed signs of pyrite disease. Perhaps 10-20% did. These were discarded, and the remainder deemed ready for sale. While in inventory, perhaps an additional 5% began to rot, and these were also discarded.
So overall we lost 20-30% due to internal cracks, rot, etc.
Given what these things cost when purchased wholesale 100 at a time, and what people were willing to pay for them (at the peak of the now-saturated market), this was an acceptable loss rate.
18th Apr 2013 04:42 UTCBob Harman
8th Jan 2015 12:14 UTCPhilip Bluemner Expert
there doesn't seem to be much info about a determined mine or mines from which the suns/dollars come from. Would the correct locality term be "coal mines around Sparta, IL"? Did they crystallize between coal layers or shale?
Best regards
Philip
8th Jan 2015 13:32 UTCDavid Von Bargen Manager
8th Jan 2015 14:19 UTCDana Slaughter 🌟 Expert
David is correct---they seem to crystalline within the shale units at the various mines. This shale is commonly referred to as "slate" on specimens that I've seen offered online---there is no slate at the area mines but the material, especially when coated, does look like common slate.
As Steve pointed out, these were readily available a couple/few years back from at least one of the wholesalers in Tucson. I hand-picked dozens of them from him at very low cost and he is a magician in terms of cleaning and prepping these things---he had the best I've ever seen.
I've seen no new ones available since that time.
8th Jan 2015 15:37 UTCBob Harman
8th Jan 2015 22:12 UTCRock Currier Expert
22nd Jan 2015 22:20 UTCKeith Compton 🌟 Manager
I have had mixed experience with these. Certainly if any Marcasite is present then they will disintegrate over time.
Which is why if you buy one - don't pay much, just enjoy while you can. They are fun things and certainly unusual.
As alluded to above, if you see any cracks in the specimen - then it's on its way out.
I guess the only way to "fake" them is gluing them back onto the shale matrix and if it is the same place in which it formed then is it fake? - bit like those Spanish Pyrites.
Cheers
Keith
5th Feb 2015 17:28 UTCPhilip Bluemner Expert
Philip
30th Aug 2015 18:59 UTCDaniel Ortolani
5th Sep 2015 19:50 UTCDaryl Ann
5th Sep 2015 20:10 UTCBob Harman
24th Jul 2016 19:02 UTCSteve Moeller
(Steve, you can't advertise you store here in the message boards.)
4th Aug 2016 00:02 UTCMatt Heaton
7th Aug 2016 14:36 UTCPeyton Cohoon
7th Aug 2016 14:38 UTCPeyton Cohoon
7th Aug 2016 14:38 UTCPeyton Cohoon
8th Aug 2016 15:16 UTCSteve Hardinger 🌟 Expert
21st Nov 2016 02:39 UTCjeff cohoon sparta il 618 317 2812
21st Nov 2016 02:44 UTCjeff cohoon sparta il 618 317 2812
21st Nov 2016 02:47 UTCjeff cohoon sparta il 618 317 2812
21st Nov 2016 05:06 UTCBikingail
17th Nov 2017 23:22 UTCkellie kulton
18th Nov 2017 03:38 UTCDoug Daniels
18th Aug 2018 05:00 UTCL Brew (Lacie Brewner)
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Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2024, except where stated. Most political location boundaries are © OpenStreetMap contributors. Mindat.org relies on the contributions of thousands of members and supporters. Founded in 2000 by Jolyon Ralph.
Privacy Policy - Terms & Conditions - Contact Us / DMCA issues - Report a bug/vulnerability Current server date and time: April 20, 2024 02:52:52