zarguy
fully equipped rock polisher
Cedar City, Utah - rockhound heaven!
Member since December 2005
Posts: 1,791
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Post by zarguy on Mar 2, 2017 12:52:02 GMT -5
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Sabre52
Cave Dweller
Me and my gal, Rosie
Member since August 2005
Posts: 20,461
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Post by Sabre52 on Mar 2, 2017 16:27:20 GMT -5
Wow! Excellent read. I have a special love for the Kambamby material cause I love green but what a beautiful display of types in the article. I got a couple of slabs from the very first find when it initially showed up at Quartzite and have since purchased a few more types but it got too pricey for me. Now I wish I had bought all they had instead of stocks and bonds *L*. Would have been a great investment....Mel
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Post by Jugglerguy on Mar 2, 2017 16:33:25 GMT -5
Thanks for the link. It's interesting to see how they mine it and how small some of the deposits were. I always heard had all been mined out, but I guess that's not true.
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Fossilman
Cave Dweller
Member since January 2009
Posts: 20,681
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Post by Fossilman on Mar 3, 2017 16:32:26 GMT -5
Putting this in the "Bookmark" section,will read it on my down time.....Thanks for sharing...
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Post by 150FromFundy on Mar 3, 2017 16:41:01 GMT -5
My kind of read. Lots of pictures! Thanks for posting.
Darryl.
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Post by parfive on Mar 5, 2017 0:13:11 GMT -5
Good article, but it wasn’t exactly a secret before Y2K. Rock & Gem featured a Smithsonian specimen on the cover back in April of 1972, a quartz and agate specimen from Madagascar. That rock’s still kickin’ around the Smithsonian, orbicular agate from Madagascar. Zoomable image
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Post by rockjunquie on Mar 5, 2017 9:46:40 GMT -5
I've bought some nice OJ from that shop. I read the article, but I can't remember if it mentioned that both the oj's are trademarked names.One can not really call kambaby Oj. Drives me crazy when ppl charge OJ prices for kambaby. Kambaby is NOT mined out.
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Post by deb193redux on Apr 8, 2017 19:36:47 GMT -5
This material is identical to feldspar heavy snowflake obsidian - spheroidal rhyolite with lots of mineralization. The spheroids begin growing in the throats of high silica volcanoes and can grow into thundereggs. I have seen many proto-t-eggs in rhyolite, such as Al's Canyon, or fully formed eggs, like Rainforest. But I have never seen a proto-t-egg in OJ or Kabamby
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Post by 1dave on Apr 8, 2017 21:50:07 GMT -5
This material is identical to feldspar heavy snowflake obsidian - spheroidal rhyolite with lots of mineralization. The spheroids begin growing in the throats of high silica volcanoes and can grow into thundereggs. I have seen many proto-t-eggs in rhyolite, such as Al's Canyon, or fully formed eggs, like Rainforest. But I have never seen a proto-t-egg in OJ or Kabamby Look closely. Those needles began as crystobalite at high temperature. Each growth pushed out impurities (non SiO2) that enclosed the needles in a perethite sphere, after cooling more cristobalite needles, another perthite sphere, repeated hundreds or thousands of times.
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Post by 1dave on Feb 16, 2020 15:11:46 GMT -5
Silica at low temperatures also form spheroids.
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Post by oregon on Feb 17, 2020 0:44:24 GMT -5
Interesting that all this material comes from a few small locations. my 'small' $10 slab with lots of features.
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Post by 1dave on Feb 17, 2020 9:21:58 GMT -5
Interesting that all this material comes from a few small locations. my 'small' $10 slab with lots of features. A LOT was going on as that part was forming. I used to think different elements must have been added to make all the different colors, but recently found out how many colors can be provided by Iron alone.
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Post by stardiamond on Feb 18, 2020 19:10:05 GMT -5
I thought I got a deal getting these for $77. The last OJ I bought was more than a decade ago. from ebay 5 1/2, 5 and 3 in length
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