cornubite
Sign in to saveCornubite is a rare secondary copper arsenate mineral with formula: Cu5(AsO4)2(OH)4. It was first described for its discovery in 1958 in Wheal Carpenter, Gwinear, Cornwall, England, UK. The name is from Cornubia, the medieval Latin name for Cornwall. It is a dimorph of cornwallite, and the arsenic analogue of pseudomalachite.
Key facts
- Mineral.name
- Cornubite
- Mineral.category
- Arsenate minerals
- Mineral.image
- Cornubite.jpg
- Mineral.caption
- Cornubite from Majuba Hill, Nevada, US. Specimen size 5 cm
- Mineral.formula
- Cu5(AsO4)2(OH)4
- Mineral.strunz
- 8.BD.30
- Mineral.dana
- 41.04.02.01
- Mineral.system
- Triclinic
- Mineral.class
- Pinacoidal () (same H-M symbol)
- Mineral.symmetry
- P
- Mineral.color
- Light or dark green
- Mineral.habit
- Fibrous, botryoidal, globular or massive, also rare tabular crystals
- Mineral.cleavage
- Distinct in two directions
- Mineral.mohs
- 4
- Mineral.luster
- Vitreous
- Mineral.refractive
- Nα = 1.87, Nβ not determined, Nγ = 1.90
- Mineral.opticalprop
- Biaxial (−)
- Mineral.birefringence
- r>v
via Wikipedia infobox
Wikidata facts
- Image
- Cornubite Tomeik.jpg
Show 6 more facts
- Strunz 8th edition (series ID, updated)
- VII/B.08
- Nickel-Strunz '10th ed', review of (9th ed/ 2009 update)
- 8.BD.30
- Commons category
- Cornubite
- Nickel-Strunz 9th edition (updated 2009)
- 8.BD.30
- IMA Mineral Symbol
- Cnb
- chemical formula
- Cu₅(AsO₄)₂(OH)₄
Sources (1)
via Wikidata · CC0
~3 min read
Article
9 sectionsContents
- Physical properties
- Optical properties
- Unit cell
- Structure
- Crystal habit
- Environment
- Type locality
- References
- External links
Cornubite is a rare secondary copper arsenate mineral with formula: Cu5(AsO4)2(OH)4. It was first described for its discovery in 1958 in Wheal Carpenter, Gwinear, Cornwall, England, UK. The name is from Cornubia, the medieval Latin name for Cornwall. It is a dimorph of cornwallite, and the arsenic analogue of pseudomalachite.
==Physical properties== Cleavage is distinct in two directions, both perpendicular to the enlarged faces of the tabular crystals, intersecting at about 70°. Cornubite is fairly soft, with hardness 4, the same as fluorite, and specific gravity 4.64, which is similar to another copper arsenate, clinoclase, at 4.38, but much denser than quartz, at 2.66.