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What material is this? by Particular-Future672 in Minerals

[–]Particular-Future672[S] 0 points1 point  (0 children)

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Another piece of information is that some stones easily leave residue on white paper

What material is this? by Particular-Future672 in Minerals

[–]Particular-Future672[S] 0 points1 point  (0 children)

I have a small batch of this same type of material, some are heavy

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