Todorokite (Na,Ca,K,Ba,Sr)1 -x(Mn,Mg,Al)6 O12 ·3 -4 H2 O IMA symbol: Tdr approved
Todorokite is an oxide or hydroxide mineral with the formula (Na,Ca,K,Ba,Sr)1-x(Mn,Mg,Al)6O12·3-4H2O, crystallizing in the monoclinic system. It has a calculated density of 3.594 g/cm3.
Crystallography Crystal system monoclinic crystal systemWikidata (CC0) Space group P 1 2/m 1 Cell (Å, °) a = 9.764, b = 2.8416, c = 9.551; α = 90, β = 94.06, γ = 90 Cell volume 264.331 ų, Z = 1 Axial ratios 3.4361:1:3.3611calculated from COD 9001165 Source structure COD 9001165 (American Mineralogist, 1988) — 1 of 4 structures
Powder X-ray diffraction (calculated) 2θ (degrees, Cu Kα1) I/I₀ (max 100) d (Å) 9.739 9.527 6.582 2.347 2.397 4.764 I/I₀ 100 97.8 53.5 25.7 21.5 21.3
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9001165; idealized occupancies, no preferred orientation.
Physical properties Density (calculated) 3.594 g/cm³calculated from COD 9001165
Classification Nickel-Strunz (10th) 4.DK.10Wikidata (CC0) Nickel-Strunz (9th) 4.DK.10Wikidata (CC0)
