Mineral phase
IMA name
Yttriaite
CAS number
1314-36-9
Class
non-silicate mineral
Compound type
oxide
Formula
$Y_2O_3$
Chemical formula
Y2O3
Elemental formula
(Y3+)2 (O2-)3
Isotope mixture type
terrestrial abundance
  Formula Name Family Number min-max Isotope mole fraction State Relevance
$Y^{3+}$ Yttrium cation element 2 constituent cation main
$O^{2-}$ Oxide anion element 3 constituent anion main
Composition comments
Common impurities: ?
Oxides
Formula $Y_{2}O_{3}$
Mass fraction (%) 100.0

Strunz

Class
oxides - hydroxides - arsenites (04)
Division
metal:oxygen = 2:3, 3:5, and similar (04.C)
Family
with large and medium-sized cations (04.CC)
Code
04.CC.

Dana

Major class
oxides and hydroxides (III)
Class
simple oxides (04)
Type
with a cation charge of 3+ (A+++2O3) (04.03)
Group
-Avicennite- group (04.03.08)
Code
04.03.08.00
Phase type
crystalline
Crystal system
isometric (cubic)
Crystal class
diploidal
Crystal class symbol
m-3 (Th)
Crystal spacegroup
Ia-3
Molar mass
225.81 $g/mol$
Density
5.01 (calc.: 5.073) $g/cm^3$
State NTP
solid
Refringence type
isotropic
Refraction index $n_{\alpha}$
1.931
Pure color
white
Color
white
Diaphaneity
transparent
Luster
adamantine