Cumengeite
Mineral Pb21Cu20Cl42(OH)40·6H2O
Take care.
- Contains lead: Wash your hands after handling it, keep it away from children, and don't make dust.
About it
Indigo-blue pyramids, best known grown on the faces of boleite cubes to make star-like specimens. From Santa Rosalía, Baja California Sur, Mexico.
- Type
- Mineral
- Group
- Halide
- Formula
- Pb21Cu20Cl42(OH)40·6H2O
- Hardness (Mohs)
- 2.5
- Specific gravity
- 4.6–4.7
- Streak
- light blue
- Lustre
- vitreous (glassy), pearly
- Crystal system
- Tetragonal
- Colours
- indigo blue
- Transparency
- translucent
- Cleavage and fracture
- good in one direction
Typical values: real specimens vary. For more, see mindat.org.