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how are the said incised surfaces created?

one of my main focus is precisely surface features (the skin) of various crystals! although the peculiar samples are mostly variants of quartz!

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Could we have more details about the incised marks please?

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Hard to say exactly Bill. I suspect that there may have been another mineral present, perhaps "dendritic".

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oh oops someone already asked haha my bad, i was actually told they are dissolution etchings or water etchings!! hmmmm~

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