Flaak 1 Posted September 15, 2020 Share Posted September 15, 2020 So recent finds at a thrift store. A jasper stromatolite kamba slab. (or so I think) And it was wasted and made into a silly christmas tree. What throws me off is it doesnt have any circles like stromatolite structures would. Although there are the right colors and a little swirliness And a very large quartz crystal (or so I think). Clearly much damage to the point itself which is why I cant say forsure it is quartz. I originally thought it could be halite but then it wouldnt have points. The only test i can think of is that it scratched glass easily. Thanks all for any help. Quote Link to post Share on other sites
Haderly 99 Posted September 15, 2020 Share Posted September 15, 2020 I would not wager a guess on the first one without a close up picture in nature light. The second one is a quartz crystal. Quote Link to post Share on other sites
Flaak 1 Posted September 15, 2020 Author Share Posted September 15, 2020 (edited) 51 minutes ago, Haderly said: I would not wager a guess on the first one without a close up picture in nature light. The second one is a quartz crystal. Okay I will take one tomorrow during the daylight :). Any guesses on what it could be be compared instead of jasper stromato if not? (even if no picture) Thanks for the pos id on the quartz Edited September 15, 2020 by Flaak Quote Link to post Share on other sites
Haderly 99 Posted September 15, 2020 Share Posted September 15, 2020 could be a serpentine if you can scratch it with a knife. It does not look like any stromatolite that I am familiar with and certainly not like the kambaba that I have. Quote Link to post Share on other sites
d_day 350 Posted September 15, 2020 Share Posted September 15, 2020 Second is certainly quartz. I’d wager the first is serpentine. It does not have the appearance of a stromatolite. Quote Link to post Share on other sites
Flaak 1 Posted September 16, 2020 Author Share Posted September 16, 2020 18 hours ago, Haderly said: could be a serpentine if you can scratch it with a knife. It does not look like any stromatolite that I am familiar with and certainly not like the kambaba that I have. 18 hours ago, d_day said: Second is certainly quartz. I’d wager the first is serpentine. It does not have the appearance of a stromatolite. It seems dark for serpentine but its definitely a good suspect to the list. Here is a close up picture . Let me know if they're fine Quote Link to post Share on other sites
Flaak 1 Posted September 16, 2020 Author Share Posted September 16, 2020 And yes I scratched with a knife. But it also scratched glass ..soo Quote Link to post Share on other sites
d_day 350 Posted September 17, 2020 Share Posted September 17, 2020 A few notes on Kambaba “jasper.” It’s not actually a jasper, nor is it a stromatolite. It’s actually rhyolite. I also just remembered there is a very similar looking stone to what you have there. It was being sold by a few of the vendors at Quartzsite a few years ago. I think they were calling it dragon stone, but I don’t remember for certain. It was quite soft. Quote Link to post Share on other sites
BMc 1,044 Posted September 17, 2020 Share Posted September 17, 2020 "Rhyolite is a rock (a silica rich volcanic rock) It can be a lava flow, volcanic ash or an obsidian that has devitrified (glass broken down into minerals). When it gets silicified, it can be termed a jasper - focusing on a term that makes it salable, or "ocean jasper" or some other glitzy term put on it by retailers" 1 Quote Link to post Share on other sites
Bedrock Bob 4,057 Posted September 17, 2020 Share Posted September 17, 2020 31 minutes ago, BMc said: "Rhyolite is a rock (a silica rich volcanic rock) It can be a lava flow, volcanic ash or an obsidian that has devitrified (glass broken down into minerals). When it gets silicified, it can be termed a jasper - focusing on a term that makes it salable, or "ocean jasper" or some other glitzy term put on it by retailers" I have always used the term "rhyolite" as any light colored volcanic. Basalt as any dark volcanic Jasper as a cryptocrystalline sub class of rhyolite. And then there is the rhyolite that is macrocrystalline and fused. Im not sure of the term. It is high silica fused rhyolite with a coarser crystal structure than jasper. It polishes well but it is not as hard and tough as jasper. I have always just called it "rhyolite" for lack of a more specific term. But that is also the term for rocks that vary pretty widely in appearance. I don't think I have ever seen a deep green rhyolite before. If I have I did not realize it was rhyolite. Quote Link to post Share on other sites
BMc 1,044 Posted September 17, 2020 Share Posted September 17, 2020 Pic represent what I used to call Rhyolite. I know for a fact that it is a Rhyolite, and that it has small garnets embedded in it. But I now know that what I have been calling Rhyolite is not exclusive of the term nor of the color. 1 Quote Link to post Share on other sites
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