Mineral Factbook

Chalcophyllite

Cu18Al2(AsO4)4(SO4)3(OH)24·36H2OIMA symbol: Chpgrandfathered

Chalcophyllite is a phosphate, arsenate, or vanadate mineral with the formula Cu18Al2(AsO4)4(SO4)3(OH)24·36H2O, crystallizing in the trigonal system. It has a calculated density of 2.686 g/cm3.

Photos

Chalcophyllite specimen photo
Ji-Elle · CC BY-SA 3.0 · Commons
Chalcophyllite specimen photo
Robert M. Lavinsky · CC BY-SA 3.0 · Commons
Chalcophyllite specimen photo
Robert M. Lavinsky · CC BY-SA 3.0 · Commons
Chalcophyllite specimen photo
Robert M. Lavinsky · CC BY-SA 3.0 · Commons

Crystallography

Crystal systemtrigonal crystal systemWikidata (CC0)
Space groupR -3 :H
Cell (Å, °)a = 10.756, b = 10.756, c = 28.678; α = 90, β = 90, γ = 120
Cell volume2873.3 ų, Z = 3
Axial ratios1.0000:1:2.6662calculated from COD 9008290
Source structureCOD 9008290 (Zeitschrift fur Kristallographie, 1980)

Powder X-ray diffraction (calculated)

2θ (degrees, Cu Kα1)I/I₀ (max 100)
d (Å)9.5592.5894.782.3442.6892.055
I/I₀1002322.414.910.47.5

xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9008290; idealized occupancies, no preferred orientation.

Physical properties

Density (calculated)2.686 g/cm³calculated from COD 9008290

Chemistry (calculated)

Molecular weight3098.38 g/molcalculated from the IMA formula
Composition (wt%)Cu 36.92%, Al 1.74%, As 9.67%, O 45.44%, S 3.1%, H 3.12%

Classification

Nickel-Strunz (10th)8.DF.30Wikidata (CC0)
Nickel-Strunz (9th)8.DF.30Wikidata (CC0)
Dana (8th)43.5.14.1Wikidata (CC0)