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Goethite, Hematite, Kalcite, quartz from Hungary
Sanded with one side of a stone containing geths, hematite, calcite and quartz minerals. The mineral association in Hungary in the Mecsek Mountains, near Zengővárkony, was exposed to iron ore mining between 1955-1956. Ferrous mining is biogenic. A significant part of it was produced by cancer coagolytes with the help of certain bacteria. Cretaceous sea associated with bottom-to-end volcanic activities. The size of the sanding is approx. 146 mm x 84 mm. Maximum thickness 48 mm. Weight: about 565 grams + pack.