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Post by velodromed on Jan 16, 2024 20:45:40 GMT -5
We find these around San Antonio, usually covered with white or yellow calcite like stuff. They are white, cloudy chalcedony (sometimes a bit blueish) with healed veins of iron oxide, I believe. It looks like a delicate rock but is far from it. I cut small slabs from it that are extremely tough. It also tumbles fairly well. If anyone has an idea what they are, I’d appreciate it. Many thanks!
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whyofquartz
spending too much on rocks
So, Africa is smaller than I expected...
Member since December 2019
Posts: 316
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Post by whyofquartz on Feb 11, 2024 10:18:28 GMT -5
I would like to know too, I have found a few of those around my place down south of SA
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Sabre52
Cave Dweller
Me and my gal, Rosie
Member since August 2005
Posts: 20,456
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Post by Sabre52 on Feb 12, 2024 17:04:37 GMT -5
Lots of similar stuff from the Rio Grande gravel deposits too. I just call it brecciated agate. Lots of puddingstone type conglomerates in the Rio Grande rocks too but rather than angular patterns like the breccia, those are composed mostly of more rounded quartz, and jasper pebbles sealed together by agate. Both types tend to be very hard material and polish well.
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Post by velodromed on Feb 12, 2024 17:24:39 GMT -5
Lots of similar stuff from the Rio Grande gravel deposits too. I just call it brecciated agate. Lots of puddingstone type conglomerates in the Rio Grande rocks too but rather than angular patterns like the breccia, those are composed mostly of more rounded quartz, and jasper pebbles sealed together by agate. Both types tend to be very hard material and polish well. Thanks! That all makes sense. There are some incredibly diverse rocks here and I love it. The interesting finds never end…
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