Rare Proustite, one of the "Ruby Silver" minerals so named for their red color and silver content. Often the ruby silver minerals quickly turn dark but this beauty has partially retained its red color. To prevent it turning darker you should keep it out of very bright light. In acrylic box.
Dimensions (millimeters): 25 x 20 x 15
Dimensions (inches): 1 x .75 x .6
Origin: Imiter Mine, Bou Azzer, Morocco
Chemistry: Silver Mineral, Ag3AsS3
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