waterboysh
spending too much on rocks
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Member since April 2021
Posts: 373
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Post by waterboysh on Jul 17, 2023 14:45:24 GMT -5
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rockbrain
Cave Dweller
Member since January 2022
Posts: 2,696
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Post by rockbrain on Jul 17, 2023 14:54:26 GMT -5
Nice shine and nice shaping! I like Kambamba Jasper a lot, even if it's not really jasper.
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Post by jasoninsd on Jul 17, 2023 21:34:35 GMT -5
I've had a soft-spot for Kambaba ever since the first time I saw it! Great looking tumbles of this material!! ![:)](//storage.proboards.com/forum/images/smiley/smiley.png)
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dillonf
fully equipped rock polisher
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Hounding and tumbling
Member since February 2022
Posts: 1,610
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Post by dillonf on Jul 17, 2023 21:56:56 GMT -5
Great batch, and a beautiful shine. Kambaba can be tricky - yours look great!
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waterboysh
spending too much on rocks
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Member since April 2021
Posts: 373
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Post by waterboysh on Jul 18, 2023 9:47:17 GMT -5
Nice shine and nice shaping! I like Kambamba Jasper a lot, even if it's not really jasper. Thanks! I really like it too. The first time I saw someone else post it, my immediate reaction was "I need some of that!" I knew it wasn't actually a jasper (true of many things called "jasper" actually). I should have spent more than 2 minutes on Google though because the first results that come up are how the stone is classified as a stromatolite, which refers to the clump of fossilized algae that created this mineral. One of the special fossils within Kambaba Jasper is actually Cyanobacteria, which is believed to have helped create the first oxygen atmosphere here on earth 2.5 - 3 billion years ago. Turns out that is completely wrong and often repeated as fact without actually checking. It's actually a green rhyolitic volcanic stone found in the Bongolava region of Madagascar. The name Kambaba comes from a river close to where the stone is mined. The black orbs in the stone resemble crocodile eyes, giving it the nickname Crocodile Jasper. These blackish, irregular shapes closely resemble some types of stromatolite fossils. In fact, many people have claimed that Kambaba Jasper is a stromatolite. However, thin-film and X-ray diffraction analysis done by the EPI-Lab (Institut Für Edelstein Prüfung, The German gemstone testing institute) shows that Kambaba Jasper is a rhyolite of volcanic origin and thus can not be considered a stromatolite. They concluded that it is composed of a green quartz, pyroxene (Aegirine), as well as soda and potash spats, circular aggregates are arranged from very small amphibole needles. Source: www.fossilera.com/pages/is-kambaba-jasper-a-stromatolite
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rockbrain
Cave Dweller
Member since January 2022
Posts: 2,696
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Post by rockbrain on Jul 18, 2023 17:46:27 GMT -5
Thanks waterboysh. I'm one of those that thought it was algae because I didn't do the research! So many things are misnamed, Cyanobacteria is often referred to as blue green algae and of course it's not algae at all.
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wargrafix
Cave Dweller
Member since June 2023
Posts: 793
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Post by wargrafix on Jul 21, 2023 20:36:19 GMT -5
Well, another stunning rock type. And that green.is amazing!
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Post by Pat on Jul 21, 2023 20:50:07 GMT -5
I first met kambaba in a rock shop somewhere on the way to South Carolina. I was immediately drawn to it (thinking it might be bird’s eye serpentine). The clerk confirmed that it was indeed just that!! Happy me.
Showed friends when I returned home. Hmmmm… not serpentine, but kambaba! Lol
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