Mineral Factbook

Wardite

NaAl3(PO4)2(OH)4·2H2OIMA symbol: Wdgrandfathered

Wardite is a phosphate, arsenate, or vanadate mineral with the formula NaAl3(PO4)2(OH)4·2H2O, crystallizing in the tetragonal system. It has a Mohs hardness of 5, typically gray in color, a specific gravity of 2.7.

Photos

Wardite specimen photo
Daderot · CC0 · Commons
Wardite specimen photo
Ra'ike (see also: de:Benutzer:Ra'ike) · CC BY-SA 3.0 · Commons
Wardite specimen photo
Robert M. Lavinsky · CC BY-SA 3.0 · Commons
Wardite specimen photo
Robert M. Lavinsky · CC BY-SA 3.0 · Commons

Crystallography

Crystal systemtetragonal crystal systemWikidata (CC0)
Space groupP 41 21 2
Cell (Å, °)a = 7.03, b = 7.03, c = 19.04; α = 90, β = 90, γ = 90
Cell volume940.974 ų, Z = 4
Axial ratios1.0000:1:2.7084calculated from COD 9009442
Source structureCOD 9009442 (Mineralogical Magazine, 1970)

Powder X-ray diffraction (calculated)

2θ (degrees, Cu Kα1)I/I₀ (max 100)
d (Å)4.7112.9853.0752.5833.1021.511
I/I₀10074.668.56444.340.9

xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9009442; idealized occupancies, no preferred orientation.

Physical properties

Density (calculated)2.752 g/cm³calculated from COD 9009442
Hardness (Mohs)
5single sourceFord, Dana's Textbook of Mineralogy, 3rd ed. (1922)
Specific gravity
2.7 g/cm3corroboratedFord, Dana's Textbook of Mineralogy, 3rd ed. (1922)
Color
graysingle sourceFord, Dana's Textbook of Mineralogy, 3rd ed. (1922)

Chemistry (calculated)

Molecular weight397.94 g/molcalculated from the IMA formula
Composition (wt%)Na 5.78%, Al 20.34%, P 15.57%, O 56.29%, H 2.03%

Classification

Nickel-Strunz (10th)8.DL.10Wikidata (CC0)
Nickel-Strunz (9th)8.DL.10Wikidata (CC0)
Dana (8th)42.7.8.2Wikidata (CC0)