Armalcolite (Mg,Fe2 +)Ti2 O5 IMA symbol: Arm redefined
Armalcolite is an oxide or hydroxide mineral with the formula (Mg,Fe2+)Ti2O5, crystallizing in the orthorhombic system. It has a calculated density of 3.642 g/cm3.
Crystallography Crystal system orthorhombic crystal systemWikidata (CC0) Space group B b m m Cell (Å, °) a = 9.7492, b = 9.9896, c = 3.746; α = 90, β = 90, γ = 90 Cell volume 364.825 ų, Z = 4 Axial ratios 0.9759:1:0.3750calculated from COD 9011263 Source structure COD 9011263 (Acta Crystallographica, Section B, 1989) — 1 of 8 structures
Powder X-ray diffraction (calculated) 2θ (degrees, Cu Kα1) I/I₀ (max 100) d (Å) 3.497 2.75 1.873 4.875 4.995 1.548 I/I₀ 100 65.1 35 31.7 20.8 19.5
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9011263; idealized occupancies, no preferred orientation.
Physical properties Density (calculated) 3.642 g/cm³calculated from COD 9011263
Classification Nickel-Strunz (10th) 4.CB.15Wikidata (CC0) Nickel-Strunz (9th) 4.CB.15Wikidata (CC0)
