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what kind of rock is this from northern minnesota

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asked Sep 8, 2016 by anelson477985 (120 points)

1 Answer

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Loaded question. The outside appears to have a layer of chalcedony, which is a micro crystalline silica. SiO2.

It is very hard. It is a type of silica where the crystals formed are very small and cannot be seen by the naked eye. It is very smooth and should feel waxy. It is also very hard. Cut in two it might show agate which is layered chalcedony. The rock inside might be rhyolite. I am not an expert.

answered Sep 8, 2016 by Weasel (40,320 points)
Is this large? Or common size.. aprox 5 pounds.

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