cubic Oxides
Cuprite
Cu2O
Crystal Structure
#! Species: Cuprite
#! System: Cubic (m3m)
#! Habit: Octahedron with cube truncation
cubic[m3m]:{111}@1.0 + {100}@0.5
cubic
m3m
{111} {100}
Quick Facts
Hardness
3.5
Specific Gravity
6.0
Refractive Index
2.848
Optical Character
Isotropic
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Open in PlaygroundPhysical Properties
Crystal Systemcubic
Hardness (Mohs)3.5
Specific Gravity6.0
CleavageImperfect {111}
FractureConchoidal to uneven
LustreAdamantine to sub-metallic
Optical Properties
Refractive Index2.848
Optical CharacterIsotropic
PleochroismNone (isotropic)
Colours
Deep redBrownish-redPurplish-redNearly black (dark crystals)
Localities
Namibia (Onganja - historic gem source)Arizona (USA - Bisbee, Morenci)AustraliaDemocratic Republic of CongoCornwall (England - historic)
Crystal Forms
octahedroncubedodecahedron
Notes
RI over refractometer limit; extremely high SG aids identification
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Open in PlaygroundRelated Minerals
Other minerals in the cubic system
