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Post by txrockhunter on Mar 21, 2015 16:25:25 GMT -5
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Sabre52
Cave Dweller
Me and my gal, Rosie
Member since August 2005
Posts: 20,455
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Post by Sabre52 on Mar 21, 2015 17:33:33 GMT -5
Standard Texican flint/chert nodule. White part is the cortex and insides are most often brown,black, gray or whitish. Some have fossils imbedded and some are geodes with crystals. They often have various sorts of banding due to deposition of different toned layers of silica sediment. I can't step out back of my house without tripping over one of them......Mel
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Post by txrockhunter on Mar 21, 2015 17:58:27 GMT -5
Mel, thanks for ID. I found many others that fit that description, mostly void of any patterns or crystals.
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Sabre52
Cave Dweller
Me and my gal, Rosie
Member since August 2005
Posts: 20,455
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Post by Sabre52 on Mar 21, 2015 21:20:06 GMT -5
Yeah, I actually have a hill I own where the Amerinds were quarrying the stuff. That particular outcrop of nodules is what they call root beer flint. Brown with bands and very glassy and translucent. We also have veins of black and banded material. Knappers call the back Austin Blue and the banded is Pedernales Chert. Edwards limestone is full of nodules of the gray and black stuff too. Amerinds were working it all over the ranch. Waste flakes everywhere you ride......Mel
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