Gerhardtite
Mineral Cu2(NO3)(OH)3
About it
A rare emerald-green copper nitrate forming thick tabular crystals in oxidized copper ores, similar in colour to atacamite. First found at the United Verde mine in Jerome, Arizona.
- Type
- Mineral
- Group
- Nitrate (with hydroxide)
- Formula
- Cu2(NO3)(OH)3
- Hardness (Mohs)
- 2
- Specific gravity
- 3.4–3.43
- Streak
- light green
- Lustre
- vitreous (glassy)
- Crystal system
- Orthorhombic
- Colours
- emerald green, dark green
- Transparency
- transparent, translucent
- Cleavage and fracture
- perfect in one direction
Typical values: real specimens vary. For more, see mindat.org.