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Block sphalerite sectional slices, produced in Poland (Pomorzany mine, Olkusz, Poland),
 14.5 x 8.7 x 2.2 cm.
Polished specimen side, the other side to retain the original ore.
It has a concentric layered structure similar to agate, by sphalerite ( brown), wurtzite (beige), galena, marcasite components.

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