cubic Nesosilicates
Spessartine
Mn3Al2(SiO4)3
Quick Facts
Hardness
7.0
Specific Gravity
4.12
Refractive Index
1.79
Optical Character
Isotropic
Crystal Structure
#! Species: Spessartine (Garnet)
#! System: Cubic (m3m)
#! Habit: Trapezohedron with dodecahedron
cubic[m3m]:{211}@1.0 + {110}@0.6
cubic
m3m
{211} {110}
Physical 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
Interactive Preview
Open this crystal in the CDL Playground to rotate, export, and explore in 3D.
Open in Playground #! Species: Spessartine (Garnet)
#! System: Cubic (m3m)
#! Habit: Trapezohedron with dodecahedron
cubic[m3m]:{211}@1.0 + {110}@0.6
Related Minerals
Other minerals in the cubic system
