Mineral phase
IMA name
Schoepite
IMA Code
Sho
Type
Class
non-silicate mineral
Compound type
oxide-hydroxide
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
$(OH)^-$ 12
$R-OH$ 2
Chemical bonds
  Bond Number
$\geq >U-O-$ 48
$-O-H$ 2
$O^--H$ 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
Molar mass
2612.49 $g/mol$
Density
4.8 $g/cm^3$
State NTP
solid
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
Pure color
yellow
Color
yellow, lemon yellow, brownish yellow, amber
Diaphaneity
transparent to translucent
Luster
adamantine
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