Euchroite
Mineral Cu2(AsO4)(OH)·3H2O
Take care.
- Contains arsenic: Wash your hands after handling it, don't make dust, and never heat it.
About it
Bright emerald-green, glassy crystals of a hydrated copper arsenate, rare and best known from Ľubietová in Slovakia.
- Type
- Mineral
- Group
- Arsenate
- Formula
- Cu2(AsO4)(OH)·3H2O
- Hardness (Mohs)
- 3.5–4
- Specific gravity
- 3.39–3.45
- Streak
- pale green
- Lustre
- vitreous (glassy)
- Crystal system
- Orthorhombic
- Colours
- emerald green, bright green
- Transparency
- transparent, translucent
- Cleavage and fracture
- poor
Typical values: real specimens vary. For more, see mindat.org.