Mineral Factbook

Valleriite

2[(Fe,Cu)S]·1.53[(Mg,Al)(OH)2]IMA symbol: Valgrandfathered

Valleriite is a sulfide or sulfosalt mineral with the formula 2[(Fe,Cu)S]·1.53[(Mg,Al)(OH)2], crystallizing in the trigonal system. It has a calculated density of 2.785 g/cm3. Its streak is black.

Photos

Valleriite specimen photo
Lodewicus de Honsvels · CC BY-SA 4.0 · Commons
Valleriite specimen photo
Lodewicus de Honsvels · CC BY-SA 4.0 · Commons
Valleriite specimen photo
John Sobolewski · CC BY 3.0 · Commons
Valleriite specimen photo
Robert M. Lavinsky · CC BY-SA 3.0 · Commons

Crystallography

Crystal systemtrigonal crystal systemWikidata (CC0)
Space groupP m m a
Cell (Å, °)a = 6.13, b = 9.81, c = 11.4; α = 90, β = 90, γ = 90
Cell volume685.5 ų, Z = 2
Axial ratios0.6249:1:1.1621calculated from COD 1011125
Source structureCOD 1011125 (Zeitschrift fuer Kristallographie, Kristallgeometrie, Kristallphysik, Kristallchemie (-144,1977), 1939)

Powder X-ray diffraction (calculated)

2θ (degrees, Cu Kα1)I/I₀ (max 100)
d (Å)5.72.6992.8363.1792.0872.236
I/I₀10063.360.84934.330.2

xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 1011125; idealized occupancies, no preferred orientation.

Physical properties

Density (calculated)2.785 g/cm³calculated from COD 1011125
Streak
blacksingle sourceWikidata (CC0)

Classification

Nickel-Strunz (10th)2.FD.30Wikidata (CC0)
Nickel-Strunz (9th)2.FD.30Wikidata (CC0)
Dana (8th)2.14.1.1Wikidata (CC0)