Solid phase
Official name
Triuranium octoxide
Secondary names
Uranium(V,VI) oxide; Uranium octoxide; Uranyl uranate; Pitchblende; U3O8
CAS number
1344-59-8
Type
Family
covalent network solid
Class
tridimentional covalent network solid
Compound type
oxide
Chemical composition
Formula
$U_3O_8$
Chemical formula
U3O8
Elemental formula
U3 O8
Isotope mixture type
terrestrial abundance
22.0
  Formula Name Family Number min-max Mole fraction Isotope mole fraction State Relevance
$U$ Uranium element 3 0.2727272727272727 1 constituent element main
$O$ Oxygen element 8 0.7272727272727273 1 constituent element main
Chemical bonds
  Bond Number
$>>U-O-$
$\geq >U-O-$
Class
tridimensional covalent networks (11)
Type
two non-metal (or one metalloid and one non-metal) atoms tridimensional networks (Ceramics) (11.03)
Phase type
crystalline
Crystal system
orthorhombic
Crystal class
pyramidal
Crystal class symbol
mm2 (C2v)
Crystal spacegroup
Amm2
Molar mass
842.08 $g/mol$
Density
8.3 $g/cm^3$
State NTP
solid
Phase transitions
Phase transition type Other phases Temperature - Pressure
solid-liquid liquid 1150°C (1420 K)
Refringence type
biaxial
Pure color
gray
Color
gray, olive green, black
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