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| Formula: | Ag3SbS3 |  Click to see a larger image |
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| Crystal: | Hexagonal | |||
| Hardness: | 2.5 | |||
| Spec. Gr.: | 5.85 | |||
| Streak: | Purplish-red | |||
| Cleavage: | Rhombohedral | |||
| Location: | Freiberg, Germany |
| 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. |
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Bibliography: Svenek, Jaroslav, Minerals, 1987, pg. 78-79. |
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