كورنواليت

Cornwallite is an uncommon copper arsenate mineral with formula Cu5(AsO4)2(OH)4. It forms a series with the phosphate pseudomalachite and is a dimorph of the triclinic cornubite. It is a green monoclinic mineral which forms as radial to fibrous encrustations. thumb|left|Botryoidal, green cornwallite in a gossan with white [[baryte from Caldbeck Fells, Cumbria (7.6 × 5.1 × 4.7 cm)]]

Key facts

Mineral.boxbgcolor: 65c131
Mineral.name: Cornwallite
Mineral.boxtextcolor: fff
Mineral.image: Cornwallite-178955.jpg
Mineral.imagesize: 260px
Mineral.caption: Cornwallite in a vug from Pastrana, Murcia, Spain (size: 4.3 × 3.7 × 2.2 cm)
Mineral.category: Arsenate mineral
Mineral.formula: Cu5(AsO4)2(OH)4
Mineral.IMAsymbol: Cnw
Mineral.strunz: 8.BD.05
Mineral.dana: 41.4.2.2
Mineral.system: Monoclinic
Mineral.class: Prismatic (2/m) (same H-M symbol)
Mineral.symmetry: P21/c
Mineral.unit cell: a = 17.33 Å, b = 5.82 Å, c = 4.60 Å; β = 92.22°; Z = 2
Mineral.color: Verdigis green, blackish-green, emerald-green
Mineral.habit: Microcrystalline radial fibrous, botryoidal to globular crusts
Mineral.cleavage: Distinct in one direction