ar·gen·tite /ˈɑrʤənˌtaɪt/
輝銀礦
Ar·gen·tite n. Min. Sulphide of silver; -- also called vitreous silver, or silver glance. It has a metallic luster, a lead-gray color, and is sectile like lead.
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argentite
n : a valuable silver ore consisting of silver sulfide (Ag2S)