Spangolite
Mineral Cu6Al(SO4)(OH)12Cl·3H2O
About it
Rare but prized dark green hexagonal tablets and short prisms in oxidized copper ore. Known from Arizona, New Mexico, and Cornwall; named for collector Norman Spang.
- Type
- Mineral
- Group
- Sulfate, basic copper-aluminum chloride-sulfate
- Formula
- Cu6Al(SO4)(OH)12Cl·3H2O
- Hardness (Mohs)
- 2–3
- Specific gravity
- 3.04–3.14
- Streak
- pale green
- Lustre
- vitreous (glassy)
- Crystal system
- Trigonal
- Colours
- dark green, blue-green
- Transparency
- transparent, translucent
- Cleavage and fracture
- perfect basal
Typical values: real specimens vary. For more, see mindat.org.