Mineral Factbook

Coffinite

U(SiO4)·nH2OIMA symbol: Cofgrandfathered

Coffinite is a silicate mineral with the formula U(SiO4)·nH2O, crystallizing in the tetragonal system. It has a calculated density of 7.155 g/cm3.

Photos

Coffinite specimen photo
Jędrzej Pełka · Public domain · Commons
Coffinite specimen photo
James St. John · CC BY 2.0 · Commons

Crystallography

Crystal systemtetragonal crystal systemWikidata (CC0)
Space groupI 41/a m d :1
Cell (Å, °)a = 6.995, b = 6.995, c = 6.263; α = 90, β = 90, γ = 90
Cell volume306.449 ų, Z = 4
Axial ratios1.0000:1:0.8954calculated from COD 9000080
Source structureCOD 9000080 (American Mineralogist, 1958)

Powder X-ray diffraction (calculated)

2θ (degrees, Cu Kα1)I/I₀ (max 100)
d (Å)3.4984.6662.6461.8072.7991.853
I/I₀1009080.960.14626.4

xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9000080; idealized occupancies, no preferred orientation.

Physical properties

Density (calculated)7.155 g/cm³calculated from COD 9000080

Classification

Nickel-Strunz (10th)9.AD.30Wikidata (CC0)
Nickel-Strunz (9th)9.AD.30Wikidata (CC0)
Dana (8th)51.5.2.4Wikidata (CC0)