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argentite

An orthorhombic mineral, Ag2S ; isometric above 180 degrees C; dimorphous with acanthite; massive or as coating; metallic lead-gray; soft, sectile; sp gr, 7.3; in veins with 162 other silver and sulfide minerals; commonly pseudomorphous after acanthite; an important ore of silver.

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  • ed.young
  • (Milwaukee, United States)

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