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Does anyone know what this piece of Thomsonite from Minnesota is worth?

+2 votes

asked May 7 by Cjb1961mn (140 points)

1 Answer

0 votes
They don't mine it, from what I understand the last mine that produced it doesn't have much any more. It is found in copper mines. I do not know everything about it. Everytime I have across it, I have bought the entire lot. I bought one about half that size in Houghton for $5.
answered May 9 by Weasel (35,750 points)

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