cubic Nesosilicates
Spessartine
Mn3Al2(SiO4)3
Crystal Structure
#! Species: Spessartine (Garnet)
#! System: Cubic (m3m)
#! Habit: Trapezohedron with dodecahedron
cubic[m3m]:{211}@1.0 + {110}@0.6
cubic
m3m
{211} {110}
Quick Facts
Hardness
7.0
Specific Gravity
4.12
Refractive Index
1.79
Optical Character
Isotropic
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Open in PlaygroundPhysical Properties
Crystal Systemcubic
Hardness (Mohs)7.0
Specific Gravity4.12
CleavageNone
FractureConchoidal to uneven
LustreVitreous to resinous
Optical Properties
Refractive Index1.79
Optical CharacterIsotropic
Dispersion0.027
PleochroismNone (isotropic)
Colours
OrangeReddish-orangeYellow-orangeMandarin orangeRed-brown
Localities
NigeriaNamibiaMozambiqueBrazilMadagascarTanzaniaSri LankaMyanmar
Common Inclusions
Wavy liquid feathersSugar-like inclusionsTwo-phase inclusionsCrystal inclusionsGrowth patterns
Known Treatments
Generally not treated
Crystal Forms
trapezohedrondodecahedron
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Open in PlaygroundRelated Minerals
Other minerals in the cubic system
