Mineral Factbook

Hydrohalite

NaCl·2H2OIMA symbol: Hhlgrandfathered

Hydrohalite is a halide mineral with the formula NaCl·2H2O, crystallizing in the monoclinic system. It has a calculated density of 1.654 g/cm3.

Photos

Hydrohalite specimen photo
Ulmanová, J.; Dolníček, Z.; Škácha, P.; Sejkora · CC BY 4.0 · Commons
Hydrohalite specimen photo
Minginimi · CC BY-SA 3.0 · Commons
Hydrohalite specimen photo
Ulmanová, J.; Dolníček, Z.; Škácha, P.; Sejkora · CC BY 4.0 · Commons

Crystallography

Crystal systemmonoclinic crystal systemWikidata (CC0)
Space groupP 1 21/c 1
Cell (Å, °)a = 6.3313, b = 10.1178, c = 6.5029; α = 90, β = 114.407, γ = 90
Cell volume379.341 ų, Z = 4
Axial ratios0.6258:1:0.6427calculated from COD 9011148
Source structureCOD 9011148 (Acta Crystallographica, Section B, 1974)

Powder X-ray diffraction (calculated)

2θ (degrees, Cu Kα1)I/I₀ (max 100)
d (Å)2.422.6053.8462.6961.9872.911
I/I₀10053.635.734.82827.6

xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9011148; idealized occupancies, no preferred orientation.

Physical properties

Density (calculated)1.654 g/cm³calculated from COD 9011148

Chemistry (calculated)

Molecular weight94.47 g/molcalculated from the IMA formula
Composition (wt%)Na 24.33%, Cl 37.53%, H 4.27%, O 33.87%

Classification

Nickel-Strunz (10th)3.BA.05Wikidata (CC0)
Nickel-Strunz (9th)3.BA.05Wikidata (CC0)