argentite

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1. a dark lead-gray sectile mineral, silver sulfide, Ag2S, occurring in crystals and as formless aggregates: an important ore of silver.

noun

1. a dark grey mineral that consists of silver sulphide, usually in cubic crystalline forms, and occurs in veins, often with native silver. It is found esp in Mexico, Nevada, and Saxony and is an important source of silver. Formula: Ag 2 S

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