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Cornwallite information


Cornwallite
Cornwallite in a vug from Pastrana, Murcia, Spain (size: 4.3 × 3.7 × 2.2 cm)
General
CategoryArsenate mineral
Formula
(repeating unit)		Cu5(AsO4)2(OH)4
IMA symbolCnw[1]
Strunz classification8.BD.05
Dana classification41.4.2.2
Crystal systemMonoclinic
Crystal classPrismatic (2/m)
(same H-M symbol)
Space groupP21/c
Unit cella = 17.33 Å, b = 5.82 Å,
c = 4.60 Å; β = 92.22°; Z = 2
Identification
ColorVerdigis green, blackish-green, emerald-green
Crystal habitMicrocrystalline radial fibrous, botryoidal to globular crusts
CleavageDistinct in one direction
FractureConchoidal
TenacityBrittle
Mohs scale hardness4.5
LusterSub-vitreous, resinous, waxy
StreakApple green
DiaphaneityTranslucent to opaque
Specific gravity4.17
Optical propertiesBiaxial (+/−)
Refractive indexnα = 1.810 – 1.820 nβ = 1.815 – 1.860 nγ = 1.850 – 1.880
Birefringenceδ = 0.040 – 0.060
2V angleMeasured: 30° to 50°
References[2][3][4][5]

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.

Botryoidal, green cornwallite in a gossan with white baryte from Caldbeck Fells, Cumbria (7.6 × 5.1 × 4.7 cm)
  1. ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
  2. ^ Mineralienatlas
  3. ^ Cornwallite in the Handbook of Mineralogy
  4. ^ Cornwallite on Mindat.org
  5. ^ Cornwallite data on Webmineral

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Cornwallite

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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...

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List of gemstones by species

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Clinozoisite Clintonite Cobaltite Colemanite Cordierite Iolite (var.) Cornwallite Corundum Ruby (var.) Sapphire (var.) Padparadscha Golden sheen sapphire...

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Connellite Cooperite Copiapite Copper Corderoite Cordierite Corkite Cornubite Cornwallite Corundum Cotunnite Covellite Coyoteite Creedite Cristobalite Crocoite...

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Paris green

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2O, conichalcite CaCu(AsO 4)(OH), cornubite Cu 5(AsO 4) 2(OH) 4·H 2O, cornwallite Cu 5(AsO 4) 2(OH) 4·H 2O, and liroconite Cu 2Al(AsO 4)(OH) 4·4H 2O. These...

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List of mineral symbols

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Csi Cornubite Cnb Carducciite Cdu Changbaiite Chg Chvaleticeite Cva Cornwallite Cnw Caresite Cre Changchengite Ccg Chvilevaite Cvi Coronadite Cor Carletonite...

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Arsenate mineral

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Cu3(AsO4)(OH)3 Conichalcite CaCu(AsO4)(OH) Cornubite Cu5(AsO4)2(OH)4 Cornwallite Cu2+5(AsO4)2(OH)2 Erythrite Co3(AsO4)2·8H2O Mimetite Pb5(AsO4)3Cl Olivenite...

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Cornubite

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from Cornubia, the medieval Latin name for Cornwall. It is a dimorph of cornwallite, and the arsenic analogue of pseudomalachite. Cleavage is distinct in...

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Liroconite

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deposits in association with olivenite, chalcophyllite, clinoclase, cornwallite, strashimirite, malachite, cuprite and limonite. Liroconite crystallizes...

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Mottramite

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Several supergene minerals including bayldonite, beudantite, brochantite, cornwallite, duftite, malachite, mimetite, philipsburgite and pseudomalachite as...

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Clara Pit

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Its most common minerals are azurite, baryte, chrysocolla, claraite, cornwallite, fluorite, goethite, clinoclase, copper, malachite, pyrite, pyromorphite...

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Wheal Gorland

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enrichment. It is the type locality for the minerals chenevixite, clinoclase, cornwallite, kernowite and liroconite. The production of the mine was very inconsistent...

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Strashimirite

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zone of copper arsenide deposits. It occurs associated with tyrolite, cornwallite, clinoclase, euchroite, olivenite, parnauite, goudeyite, arthurite, metazeunerite...

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St Day

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mine is the type locality for the minerals: chenevixite, clinoclase, cornwallite, kernowite, and liroconite. The population of St Day was 1,821 at the...

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Kernowite

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c.1800 in the Wheal Gorland mine, St Day, Cornwall. Cornwall portal Cornwallite – a mineral also named after Cornwall P. C. Burns; R. K. Eby; F. C. Hawthorne...

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