Afwillite Ca3 [SiO3 (OH)]2 ·2 H2 O IMA symbol: Afw grandfathered
Afwillite is a silicate mineral with the formula Ca3[SiO3(OH)]2·2H2O, crystallizing in the monoclinic system. It has a calculated density of 2.628 g/cm3. Its streak is white.
Crystallography Crystal system monoclinic crystal systemWikidata (CC0) Space group P 1 Cell (Å, °) a = 16.33, b = 5.6389, c = 11.685; α = 90.08, β = 126.446, γ = 89.95 Cell volume 865.546 ų, Z = 4 Axial ratios 2.8960:1:2.0722calculated from COD 9013984 Source structure COD 9013984 (Crystallography Reports, 2009) — 1 of 3 structures
Powder X-ray diffraction (calculated) 2θ (degrees, Cu Kα1) I/I₀ (max 100) d (Å) 2.843 2.842 3.178 3.182 2.819 6.568 I/I₀ 100 99.9 95.3 95 93.5 92.5
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9013984; idealized occupancies, no preferred orientation.
Physical properties Density (calculated) 2.628 g/cm³calculated from COD 9013984 Streak whitesingle source Wikidata (CC0)
Chemistry (calculated) Molecular weight 342.45 g/molcalculated from the IMA formula Composition (wt%) Ca 35.11%, Si 16.4%, O 46.72%, H 1.77%
Classification Nickel-Strunz (10th) 9.AG.75Wikidata (CC0) Nickel-Strunz (9th) 9.AG.75Wikidata (CC0) Dana (8th) 52.4.7.1Wikidata (CC0)
