hh5
starting to spend too much on rocks
Member since January 2012
Posts: 136
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Post by hh5 on Feb 16, 2019 12:50:24 GMT -5
The first 2 pictures are of the same stone which has a hardness of 7+ and looks like a porcelain jasper to me, but also looks like pictures I have seen of Kona Dolomite. The 3rd picture is some sort of jasper agate, any ideas? Thanks for any and all help.
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Deleted
Deleted Member
Member since January 1970
Posts: 0
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Post by Deleted on Feb 16, 2019 13:03:24 GMT -5
First certainly looks like rhodonite, though that would have a Mohs of just under 7. Second almost looks like a thunderegg core, but no shell so probably not.
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hh5
starting to spend too much on rocks
Member since January 2012
Posts: 136
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Post by hh5 on Feb 16, 2019 13:57:59 GMT -5
Hi rocks2dust, yes the first stone does resemble Rhodonite. But this material is much less dense and harder than Rhodonite.
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Deleted
Deleted Member
Member since January 1970
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Post by Deleted on Feb 16, 2019 14:50:05 GMT -5
I'd also considered brecciated rhyolites and feldspars, but like the dolomite you mentioned, both would be softer than Mohs 7. Those black lines would seem to indicate manganese (rather than something like iron) doing the coloring. The other pink mangan-bearing minerals Mohs 7+ that I can think (e.g., chambersite or povondraite) are found as small crystals within softer material that would be easily scratched by quartz. I hope someone else can ID a possibility for you.
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Post by taylor on Feb 16, 2019 14:51:59 GMT -5
The pattern of the first one does resemble Kona Dolomite, but the Kona I have worked is much softer--around 5.5.
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Post by Rockoonz on Feb 16, 2019 15:37:53 GMT -5
Yep, the first really does look like marble (dolomite) bit at 7+ it just about has to be a quartz variant. The 2nd one is almost certainly polka dot agate. Specifically from the area where the Native Americans were heating it for arrowheads. We have a bit of the material from that hillside.
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Post by vegasjames on Feb 16, 2019 19:19:09 GMT -5
The first one could also be orthoclase.
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