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|Pyrargyrite is historically known as "dark red silver ore." Its red changes to black when exposed to various forms of radiation, or excessive light. It forms in many-faceted perfect columnar crystals, which sometimes are striated. It fills cavities in ore veins. Exceptional crystals were found at Freiberg, Germany; Príbram, Czechoslovakia; Guanajuato, Mexico; and Chalanches, France.|
Bibliography: Svenek, Jaroslav, Minerals, 1987, pg. 78-79.
University of California, Santa BarbaraDepartment of Earth Science
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