Uranium Mine 21, Haje Prbram, Czech RepublicA silver replacement after dyscrasite, on massive silver (and arsenic) ore, this is classic old European material which has heft. First described in 1797 following a find in the Wenzel Mine, Black Forest, Germany, the name dyscrasite comes from the Greek word meaning "a bad alloy." It occurs as a hydrothermal mineral in silver bearing veins in association with native silver, pyrargyrite, acanthite, stromeyerite, tetrahedrite, allemontite, galena, calcite and baryte. Dyscrasite is a metal ore and is opaque. The present specimen is capable of standing on its own, showing sprays of large crystals to the face, dramatically contrasting with the dark matrix. Measuring 4 1/2 x 3 x 2 in