standles
spending too much on rocks
Well all I got was a rock ... Cool!
Member since February 2021
Posts: 325
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Post by standles on Apr 17, 2021 21:04:02 GMT -5
Tumbling some leopard skin jasper and several had these metallic inclusions. All were square and about same size. The pics are 2 examples of of 60 grit and dry. Any idea what it might be? My first thought was galena but not sure if thats found with jasper.
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Post by amygdule on Apr 17, 2021 21:31:01 GMT -5
Pyrite ?
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Wooferhound
Cave Dweller
Lortone QT66 and 3A
Member since December 2016
Posts: 1,423
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Post by Wooferhound on Apr 18, 2021 6:28:41 GMT -5
Silicon Carbide ?
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Sabre52
Cave Dweller
Me and my gal, Rosie
Member since August 2005
Posts: 20,456
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Post by Sabre52 on Apr 18, 2021 8:19:05 GMT -5
Yup, pyrite. Not uncommon to find crystals in jasper. Certain spots in Hunters Valley, Ca where the Hornitos type jasper comes from are full of iron sulfides like pyrite. The sulfides are often gold bearing too so sometimes you see a little gold in the jasper from that locale.
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standles
spending too much on rocks
Well all I got was a rock ... Cool!
Member since February 2021
Posts: 325
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Post by standles on Apr 18, 2021 9:23:24 GMT -5
Maybe.. Hmmm Wouldn't think that would be metallic sheen but possible. Yup, pyrite. Not uncommon to find crystals in jasper. Certain spots in Hunters Valley, Ca where the Hornitos type jasper comes from are full of iron sulfides like pyrite. The sulfides are often gold bearing too so sometimes you see a little gold in the jasper from that locale. I didn't know that. thanks for the info. I have tumbled several different varieties of jasper but this was first time seeing these inclusions.
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stefan
Cave Dweller
Member since January 2005
Posts: 14,095
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Post by stefan on Apr 18, 2021 9:52:46 GMT -5
Just be careful as the inclusions are softer than the base material and will probably undercut and could cause issues down the road. Very cool none the less.
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Wooferhound
Cave Dweller
Lortone QT66 and 3A
Member since December 2016
Posts: 1,423
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Post by Wooferhound on Apr 18, 2021 10:48:53 GMT -5
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standles
spending too much on rocks
Well all I got was a rock ... Cool!
Member since February 2021
Posts: 325
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Post by standles on Apr 18, 2021 14:33:30 GMT -5
Wow I had no idea it would polish metalic. Guess I alwaays just saw it as black grit.
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rrod
having dreams about rocks
Member since December 2020
Posts: 72
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Post by rrod on Apr 18, 2021 14:49:35 GMT -5
Wow I had no idea it would polish metalic. Guess I alwaays just saw it as black grit. And in another crystal form it's moissanite.
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Sabre52
Cave Dweller
Me and my gal, Rosie
Member since August 2005
Posts: 20,456
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Post by Sabre52 on Apr 18, 2021 18:04:33 GMT -5
Both pyrite and the closely related marcasite inclusions (they differ in crystal structure) take a nice polish on wheels. The take a nice shine but do often undercut in the tumbler. Sometimes cabs rust over time too. Didn't know that till it happened once *L*. But then I have other marcasite and pyrite in cabs that have gone 20 years without rusting.
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Post by stephan on Apr 18, 2021 20:28:39 GMT -5
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standles
spending too much on rocks
Well all I got was a rock ... Cool!
Member since February 2021
Posts: 325
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Post by standles on Apr 22, 2021 9:02:50 GMT -5
Yeah these were some of more non leopardy pcs. Rest looks more like you show
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