Mineral phase
IMA name
Molybdite
Type
Class
non-silicate mineral
Compound type
oxide
Chemical composition
Formula
$MoO_3$
Chemical formula
MoO3
Elemental formula
Mo O3
Isotope mixture type
terrestrial abundance
  Formula Name Family Number min-max Isotope mole fraction State Relevance
$Mo$ Molybdenum element 1 constituent element main
$O$ Oxygen element 3 constituent element main
Chemical bonds
  Bond Number
$\geq \mid Mo-O-$ 6
Oxides
Formula $MoO_{3}$
Mass fraction (%) 100.0

Strunz

Class
oxides - hydroxides - arsenites (04)
Division
metal:oxygen inf or = 1:2 (04.E)
Family
(M2O5, MO3) (04.EA)
Code
04.EA.10

Dana

Major class
oxides and hydroxides (III)
Class
simple oxides (04)
Type
with a cation charge of 6+ (A++++++ O3) (04.05)
Group
-Molybdite- group (04.05.01)
Code
04.05.01.01
Phase type
crystalline
Crystal system
orthorhombic
Crystal class
dipyramidal
Crystal class symbol
mmm (D2h)
Crystal spacegroup
Pnma
Molar mass
143.94 $g/mol$
Density
4.72 $g/cm^3$
State NTP
solid
Refringence type
biaxial
Refringence sign
unknown
Refraction index $n_{\alpha}$
2.12 - 2.13
Pure color
colorless
Color
colorless, greenish yellow, light greenish yellow
Diaphaneity
transparent
Luster
adamantine
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