Annite KFe2 +3 (AlSi3 O10 )(OH)2 IMA symbol: Ann approved
Annite is a silicate mineral with the formula KFe2+3(AlSi3O10)(OH)2, crystallizing in the monoclinic system. It has a calculated density of 3.211 g/cm3.
Crystallography Crystal system monoclinic crystal systemWikidata (CC0) Space group C 1 2/m 1 Cell (Å, °) a = 5.3741, b = 9.3083, c = 10.2829; α = 90, β = 100.22, γ = 90 Cell volume 506.228 ų, Z = 2 Axial ratios 0.5773:1:1.1047calculated from COD 9002841 Source structure COD 9002841 (American Mineralogist, 2002) — 1 of 14 structures
Powder X-ray diffraction (calculated) 2θ (degrees, Cu Kα1) I/I₀ (max 100) d (Å) 10.12 2.647 3.373 2.459 2.195 2.644 I/I₀ 100 29.8 23.1 17.4 15.6 14.9
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9002841; idealized occupancies, no preferred orientation.
Physical properties Density (calculated) 3.211 g/cm³calculated from COD 9002841
Classification Nickel-Strunz (10th) 9.EC.20Wikidata (CC0) Nickel-Strunz (9th) 9.EC.20Wikidata (CC0)
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