Dufrénoysite
Mineral Pb2As2S5
Take care.
- Contains lead: Wash your hands after handling it, keep it away from children, and don't make dust.
- Contains arsenic: Wash your hands after handling it, don't make dust, and never heat it.
About it
Lead-grey to steel grey tabular crystals of lead arsenic sulfide with a reddish brown streak. First described from the Lengenbach quarry, Binn Valley, Switzerland.
- Type
- Mineral
- Group
- Sulfosalt
- Formula
- Pb2As2S5
- Hardness (Mohs)
- 3
- Specific gravity
- 5.5–5.6
- Streak
- reddish brown
- Lustre
- metallic
- Crystal system
- Monoclinic
- Colours
- lead grey, steel grey
- Transparency
- opaque
- Cleavage and fracture
- perfect in one direction
Typical values: real specimens vary. For more, see mindat.org.