1. argentite; silver glance
Wikipedia definition
2. ArgentiteArgentite was primarily treated as a mineral belonging to the galena group, cubic silver sulfide, occasionally found as uneven cubes and octahedra, but more often as dendritic or earthy masses, with a blackish lead-grey color and metallic lustre. All these forms are structurally not argentite, but its monoclinic polymorph, acanthite. Due to instability in normal air temperature, the IMA commission decided to reject this mineral, which now is a discredited mineral species.
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