Mineral phase
IMA name
Yttriaite-(Y)
CAS number
7440-65-5
Type
Class
non-silicate mineral
Compound type
oxide
Chemical composition
Formula
$Y_2O_3$
Chemical formula
Y2O3
Elemental formula
(Y3+) (O2-)
Isotope mixture type
terrestrial abundance
  Formula Name Family Number min-max Isotope mole fraction State Relevance
$Y^{3+}$ Yttrium cation element 1 constituent cation main
$O^{2-}$ Oxide anion element 1 constituent anion main
Chemical functions
  Function Number
$(OH)^-$ 3
Chemical bonds
  Bond Number
$\cdot (\cdot) Y^{3+} \cdot O^{-}-$ 3
$O^--H$ 1
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.00

Dana

Major class
oxides and hydroxides (III)
Class
simple oxides (04)
Type
with a cation charge of 3+ (A+++2O3) (04.03)
Group
-Macedonite- group (04.03.06)
Code
04.03.06.02
Phase type
crystalline
Crystal system
tetragonal
Crystal class
ditetragonal-dipyramidal
Crystal class symbol
4/mmm (D4h)
Crystal spacegroup
I4(1)/amd
Molar mass
183.88 $g/mol$
Density
4.4 - 5.1 $g/cm^3$
State NTP
solid
Refringence type
uniaxial
Refringence sign
positive
Birefringence
0.095
Refraction index $n_o$ (w)
1.721
Refraction index $n_e$ (e)
1.816
Pure color
brown
Color
yellowish brown, greenish brown, gray, reddish brown, brown
Diaphaneity
opaque
Luster
vitreous
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