Legrandite Zn2 (AsO4 )(OH)·H2 O IMA symbol: Leg grandfathered
Legrandite is a phosphate, arsenate, or vanadate mineral with the formula Zn2(AsO4)(OH)·H2O, crystallizing in the monoclinic system. It has a calculated density of 4.023 g/cm3. Its streak is white.
Crystallography Crystal system monoclinic crystal systemWikidata (CC0) Space group P 1 21/c 1 Cell (Å, °) a = 12.8014, b = 7.939, c = 10.2262; α = 90, β = 104.49, γ = 90 Cell volume 1006.23 ų, Z = 8 Axial ratios 1.6125:1:1.2881calculated from COD 1544638 Source structure COD 1544638 (Journal of Mineralogical and Petrological Sciences, 2016) — 1 of 4 structures
Powder X-ray diffraction (calculated) 2θ (degrees, Cu Kα1) I/I₀ (max 100) d (Å) 4.074 5.924 3.097 4.201 3.025 6.685 I/I₀ 100 77.4 75.8 69 59.5 58.7
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 1544638; idealized occupancies, no preferred orientation.
Physical properties Density (calculated) 4.023 g/cm³calculated from COD 1544638 Streak whitesingle source Wikidata (CC0)
Chemistry (calculated) Molecular weight 304.76 g/molcalculated from the IMA formula Composition (wt%) Zn 42.92%, As 24.58%, O 31.5%, H 0.99%
Classification Nickel-Strunz (10th) 8.DC.10Wikidata (CC0) Nickel-Strunz (9th) 8.DC.10Wikidata (CC0)
