Hafnon Hf(SiO4 ) IMA symbol: Haf approved
Hafnon is a silicate mineral with the formula Hf(SiO4), crystallizing in the tetragonal system. It has a Mohs hardness of 7.5, a calculated density of 6.977 g/cm3.
Crystallography Crystal system tetragonal crystal systemWikidata (CC0) Space group I 41/a m d :2 Cell (Å, °) a = 6.5725, b = 6.5725, c = 5.9632; α = 90, β = 90, γ = 90 Cell volume 257.597 ų, Z = 4 Axial ratios 1.0000:1:0.9073calculated from COD 9000852 Source structure COD 9000852 (American Mineralogist, 1982)
Powder X-ray diffraction (calculated) 2θ (degrees, Cu Kα1) I/I₀ (max 100) d (Å) 3.286 4.416 2.51 1.705 2.636 2.056 I/I₀ 100 89.5 72.7 59.3 33 23.6
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9000852; idealized occupancies, no preferred orientation.
Physical properties Density (calculated) 6.977 g/cm³calculated from COD 9000852 Hardness (Mohs) 7.5single source Wikidata (CC0)
Chemistry (calculated) Molecular weight 270.57 g/molcalculated from the IMA formula Composition (wt%) Hf 65.97%, Si 10.38%, O 23.65%
Classification Nickel-Strunz (10th) 9.AD.30Wikidata (CC0) Nickel-Strunz (9th) 9.AD.30Wikidata (CC0) Dana (8th) 51.5.2.2Wikidata (CC0)
