Mottramite
Mineral PbCu(VO4)(OH)
Also called Cuprodescloizite and Psittacinite
Take care.
- Contains lead: Wash your hands after handling it, keep it away from children, and don't make dust.
About it
Olive-green to blackish crusts and tiny crystals, the copper partner of descloizite. Named for Mottram St Andrew in Cheshire; fine at Tsumeb in Namibia and in Arizona.
- Type
- Mineral
- Group
- Vanadate, adelite-descloizite group
- Formula
- PbCu(VO4)(OH)
- Hardness (Mohs)
- 3–3.5
- Specific gravity
- 5.7–6.2
- Streak
- yellowish green
- Lustre
- greasy, vitreous (glassy)
- Crystal system
- Orthorhombic
- Colours
- olive green, grass green, brown, black
- Transparency
- translucent, opaque
- Cleavage and fracture
- none; uneven fracture
Typical values: real specimens vary. For more, see mindat.org.