weaselguys
having dreams about rocks
Member since September 2020
Posts: 68
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Post by weaselguys on Sept 13, 2020 6:08:48 GMT -5
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Post by Peruano on Sept 13, 2020 7:15:14 GMT -5
The banding in the first 3 photos make them agates. In my view you can find chalcedony with a pattern but its less distinct and more likely to be muddled even after being wetted or polished.
The stuff in the truck is hard to call because of the photo. It could be whitish quartzite or any of the chalcedony family. Check out the Quartz page (google it) to hone your understanding.
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Fossilman
Cave Dweller 
Member since January 2009
Posts: 20,723 
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Post by Fossilman on Sept 13, 2020 9:59:06 GMT -5
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weaselguys
having dreams about rocks
Member since September 2020
Posts: 68
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Post by weaselguys on Sept 13, 2020 12:46:52 GMT -5
Correct me if I am wrong here but not all agate has banding because some could be a piece broken off from a bigger piece that had banding or it never got the impurities that caused the banding. We light test our agate to separate it from the chalcedony and if a piece is to solid in the thickest part to allow light through it then in with the chalcedony it goes.
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weaselguys
having dreams about rocks
Member since September 2020
Posts: 68
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Post by weaselguys on Sept 13, 2020 12:55:21 GMT -5
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