Conichalcite
Mineral CaCu(AsO4)(OH)
Take care.
- Contains arsenic: Wash your hands after handling it, don't make dust, and never heat it.
About it
Bright grass-green botryoidal crusts and tiny crystals, often on limonite, in oxidized copper ore with arsenic. Fine from Mapimí in Mexico and the Tintic district of Utah.
- Type
- Mineral
- Group
- Arsenate, adelite-descloizite group
- Formula
- CaCu(AsO4)(OH)
- Hardness (Mohs)
- 4.5
- Specific gravity
- 4.1–4.35
- Streak
- green
- Lustre
- vitreous (glassy), greasy
- Crystal system
- Orthorhombic
- Colours
- grass green, yellowish green, emerald green
- Transparency
- translucent
- Cleavage and fracture
- none; uneven fracture
Typical values: real specimens vary. For more, see mindat.org.