Stephanite
Mineral Ag5SbS4
Also called Brittle silver ore
Take care.
- Toxic: Wash your hands after handling it, don't lick or taste it, and don't make dust.
About it
Black, brittle tabular or short prismatic crystals, often in six-sided twins; a rich silver ore. Classic from Freiberg, Germany, Příbram, Czechia, and the Comstock Lode in Nevada.
- Type
- Mineral
- Group
- Sulfosalt
- Formula
- Ag5SbS4
- Hardness (Mohs)
- 2–2.5
- Specific gravity
- 6.2–6.3
- Streak
- iron black
- Lustre
- metallic
- Crystal system
- Orthorhombic
- Colours
- iron black, lead grey
- Transparency
- opaque
- Cleavage and fracture
- imperfect; uneven fracture, brittle
Typical values: real specimens vary. For more, see mindat.org.