Garnet
From The Gemology Project
Garnet | |
---|---|
Chemical composition | L3M2(SiO4)3
Isomorphous series |
Crystal system | Cubic |
Habit | Dodecahedra |
Cleavage | None |
Hardness | 6.5-7.5 |
Optic nature | Isotropic |
Refractive index | 1.74-1.89 |
Birefringence | None |
Specific gravity | 3.60-4.20 |
Lustre | Vitreous to sub-adamantine |
Garnet is a group of minerals, with similar chemical composition and a common crystal habit. The following are the 6 members of the garnet family:
Almandine
Pyrope
Grossular
Spessartite
Andradite
Uvarovite