Pentagonite CaV4 +OSi4 O10 ·4 H2 O IMA symbol: Ptg approved
Pentagonite is a silicate mineral with the formula CaV4+OSi4O10·4H2O, crystallizing in the orthorhombic system. It has a calculated density of 2.247 g/cm3.
Crystallography Crystal system orthorhombic crystal systemWikidata (CC0) Space group C c m 21 Cell (Å, °) a = 10.376, b = 14.062, c = 8.984; α = 90, β = 90, γ = 90 Cell volume 1310.83 ų, Z = 4 Axial ratios 0.7379:1:0.6389calculated from COD 9014622 Source structure COD 9014622 (Journal of Mineralogical and Petrological Sciences, 2009) — 1 of 2 structures
Powder X-ray diffraction (calculated) 2θ (degrees, Cu Kα1) I/I₀ (max 100) d (Å) 8.349 6.116 3.515 3.956 3.786 4.493 I/I₀ 100 59.1 38.6 27.2 24.7 23.5
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9014622; idealized occupancies, no preferred orientation.
Physical properties Density (calculated) 2.247 g/cm³calculated from COD 9014622
Classification Nickel-Strunz (10th) 9.EA.55Wikidata (CC0) Nickel-Strunz (9th) 9.EA.55Wikidata (CC0)
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