Mineral phase
IMA name
Cuprite
IMA Code
Cpr
Type
Class
non-silicate mineral
Compound type
oxide
Chemical composition
Formula
$Cu_2O$
Chemical formula
Cu2O
Elemental formula
Cu2 O
Isotope mixture type
terrestrial abundance
  Formula Name Family Number min-max Isotope mole fraction State Relevance
$Cu$ Copper element 2 constituent element main
$O$ Oxygen element 1 constituent element main
Chemical bonds
  Bond Number
$Cu-Cu$ 3
$Cu-O-$ 2
Oxides
Formula $Cu_{2}O$
Mass fraction (%) 100.0

Strunz

Class
oxides - hydroxides - arsenites (04)
Division
metal:oxygen = 2.1 and 1:1 (04.A)
Family
M:O = 2:1 (and 1.8:1) (04.AA)
Code
04.AA.10

Dana

Major class
oxides and hydroxides (III)
Class
simple oxides (04)
Type
with a cation charge of 1+ (A+2O) (04.01)
Group
-Cuprite- group (04.01.01)
Code
04.01.01.01
Phase type
crystalline
Crystal system
isometric (cubic)
Crystal class
hexoctahedral
Crystal class symbol
m-3m (Oh)
Crystal spacegroup
Pn-3m
Molar mass
143.09 $g/mol$
Density
6.1 $g/cm^3$
State NTP
solid
Refringence type
isotropic
Refringence sign
no
Birefringence
0
Refraction index $n_{\alpha}$
2.849
Pure color
red
Color
brown red, purple red, red, black
Diaphaneity
transparent to translucent
Luster
adamantine
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