Constituent
Name
Schoepite
IMA name
Schoepite
Class
non-silicate mineral
Compound type
oxide-hydroxide
Constituent abundance in material
Relevance
main - major
Arrangement
single phase
Mass fraction
1.0
Chemical composition
Formula
$(UO_2)_8O_2(OH)_{12} \bullet 12(H_2O)$
Chemical formula
(UO2)8O2(OH)12•12(H2O)
Elemental formula
U8 O30 H36 (O-)12
Isotope mixture type
terrestrial abundance
  Formula Name Family Number min-max Isotope mole fraction State Relevance
$U$ Uranium element 8 constituent element main
$O$ Oxygen element 18 constituent element main
$(OH)^-$ Hydroxide anion chemical function 12 anionic radical main
$H_2O$ Water molecule 12 hydration main
Chemical functions
  Function Number Relevance
$(OH)^-$ 12
$R-OH$ 2 main
Chemical bonds
  Bond Number Relevance
$\geq >U-O-$ 48
$-O-H$ 2 main
$O^--H$ 1
Oxides
Formula $UO_{2}$ $H_{2}O$
Mass fraction (%) 82.69 12.41

Strunz

Class
oxides - hydroxides - arsenites (04)
Division
uranyl hydroxides (04.G)
Family
without additional cations (04.GA)
Code
04.GA.05

Dana

Major class
oxides and hydroxides (III)
Class
oxides containing uranium and thorium (05)
Type
with a cation charge of 6+ (AO3) and hydrated (05.02)
Group
Schoepite Group (05.02.01)
Code
05.02.01.03
Phase type
crystalline
Crystal system
orthorhombic
Crystal class
dipyramidal
Crystal class symbol
mmm (D2h)
Crystal spacegroup
Pbca
Texture
polycrystalline
Molar mass
2612.49 $g/mol$
Density
4.8 $g/cm^3$
Refringence type
biaxial
Refringence sign
negative
Birefringence
0.045
Refraction index $n_{\alpha}$
1.69
Refraction index $n_{\beta}$
1.714
Refraction index $n_{\gamma}$
1.735
Color
yellow, lemon yellow, brownish yellow, amber
Diaphaneity
transparent to translucent
Luster
adamantine