cubic Nesosilicates
Spessartine
Formula 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
Physical Properties
- Crystal System
- cubic
- Hardness (Mohs)
- 7.0
- Specific Gravity
- 4.12
- Cleavage
- None
- Fracture
- Conchoidal to uneven
- Lustre
- Vitreous to resinous
Optical Properties
- Refractive Index
- 1.79
- Optical Character
- Isotropic
- Dispersion
- 0.027
- Pleochroism
- None (isotropic)
Characteristics
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
Related Minerals
Other minerals in the cubic system
