a mineral, silver antimony sulfide, AgSbS2, sometimes containing As. Miargyrite crystallizes in the mono-clinic system. The crystals are usually tabular. The color ranges from iron-black to steel-gray. In thin splinters the mineral is transluscent and of blood-red color. The luster is adamantine. Strongly anisotropic, miargyrite has a hardness of 2–2.5 on Mohs’ scale and a density of 5,100–5,300 kg/m3. It is found in hydrothermal veins with other silver-bearing minerals and with galenite and sphalerite. Miargyrite is a rare mineral.