Miargyrite - AgSbS₂

Habit: Thick tabular crystals, often deeply striated, also massive. Iron-black to steel-gray. Nearly opaque; translucent in thin fragments, Metallic Adamantine Luster.

Environment: In Hydrothermal veins of low-temperature origin.

Etymology: From the Greek, meyon, "smaller" and argyros, "silver" for it contains less silver than pyrargyrite which it was often mistaken for