Mineral Factbook

Annabergite

Ni3(AsO4)2·8H2OIMA symbol: Anbgrandfathered

Annabergite is a phosphate, arsenate, or vanadate mineral with the formula Ni3(AsO4)2·8H2O, crystallizing in the monoclinic system. It has typically green in color, a calculated density of 3.146 g/cm3. Its streak is white or green.

Photos

Annabergite specimen photo
Nessa Eull · CC0 · Commons
Annabergite specimen photo
Nessa Eull · CC0 · Commons
Annabergite specimen photo
Raimond Spekking · CC BY-SA 3.0 · Commons
Annabergite specimen photo
Ra'ike (see also: de:Benutzer:Ra'ike) · CC BY-SA 3.0 · Commons

Crystallography

Crystal systemmonoclinic crystal systemWikidata (CC0)
Space groupC 1 2/m 1
Cell (Å, °)a = 10.179, b = 13.309, c = 4.725; α = 90, β = 105, γ = 90
Cell volume618.296 ų, Z = 2
Axial ratios0.7648:1:0.3550calculated from COD 9005272
Source structureCOD 9005272 (European Journal of Mineralogy, 1996)

Powder X-ray diffraction (calculated)

2θ (degrees, Cu Kα1)I/I₀ (max 100)
d (Å)6.6543.27.9082.7212.9822.986
I/I₀10035.93027.325.819.9

xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9005272; idealized occupancies, no preferred orientation.

Physical properties

Density (calculated)3.146 g/cm³calculated from COD 9005272
Color
greensingle sourceDana, System of Mineralogy, 6th ed. (1892)
Streak
green, whitesingle sourceDana, System of Mineralogy, 6th ed. (1892)

Chemistry (calculated)

Molecular weight598.04 g/molcalculated from the IMA formula
Composition (wt%)Ni 29.44%, As 25.06%, O 42.8%, H 2.7%

Classification

Nickel-Strunz (10th)8.CE.40Wikidata (CC0)
Nickel-Strunz (9th)8.CE.40Wikidata (CC0)
Dana (8th)40.3.6.4Wikidata (CC0)