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Post by arghvark on Aug 13, 2020 13:50:02 GMT -5
Ok, this is sort of a game. I know where I found it. I'll give more details if you're interested but first I'm curious how folks would identify this based on appearance only. One small stone out of my last batch:
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lordsorril
freely admits to licking rocks
Member since April 2020
Posts: 766
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Post by lordsorril on Aug 13, 2020 14:59:29 GMT -5
Kinda looks like desert jasper to me, but, grainier.
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Post by woodman on Aug 13, 2020 15:45:05 GMT -5
Oregon Jasper of some sort, there are many different ones.
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One tumble
Aug 27, 2020 12:35:47 GMT -5
via mobile
Post by arghvark on Aug 27, 2020 12:35:47 GMT -5
Heh, not many seem interested, but I'll ramble on about it anyway. Oregon Jasper of some sort, there are many different ones. This is exactly what I thought it looked like. Found 5-8 or more hours drive from most of those Oregon deposits, in north central Nevada. I was looking for something completely different and stumbled on an area with a lot of waste flakes from indigenous people working this material. Some of it is gorgeous. Much of it has very high quality jasper texture. Based on the size of some of the rejects (some are surprisingly large) and varying quality, I guessed that the source was pretty close. My thought was that anything of questionable quality wouldn't have been transported long distances. After another couple prospecting trips I found what I believe was the source, only a mile and a half or so from where I found all the waste flakes. Clearly a large quarry area that was used for a very long time, based on the amount of waste. Even found several obvious spalls that had been rejected. Here's where it gets interesting to me. Most of the quarry area is clearly rhyolite of the wonderstone variety, but much of it is the same colors as the piece shown. It ranges from pretty soft and porous to very hard and "jaspery", with the softer stuff containing reds, pinks, and yellows as well as the blue-greens and browns. Not a lot of of the high quality stuff to be found, but enough small pieces to indicate that this is probably the source, and that perhaps the quarry was played out of its best stuff. I don't know enough about how jasper is formed. Can rhyolite be "transformed" into jasper? In other areas I have found wonderstone which seems to be highly silicified. ETA: about an hour further west there are deposits that some people call picture jasper, but not nearly the quality found in central/eastern Oregon.
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RWA3006
Cave Dweller
Member since March 2009
Posts: 4,175
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Post by RWA3006 on Oct 1, 2020 17:46:47 GMT -5
Ok, this is sort of a game. I know where I found it. I'll give more details if you're interested but first I'm curious how folks would identify this based on appearance only. One small stone out of my last batch: As soon as I saw the photo it reminded me of some banded rhyolite you sent me a year ago in a trade.
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Post by TheRock on Oct 4, 2020 12:29:45 GMT -5
Rock On!
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