Description
This is a polished slice of schalenblende, an ore composed of sphalerite, galena and marcasite from the Schmalgraf mine in Lontzen, Belgium. A classic of European zinc mineralogy, the deposit lies between the town of Lontzen and La Calamine (in German, Kelmis). La Calamine takes its name from a zinc ore called calamine, once abundant in the subsoil and mined until the end of the XIXe century.
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