From The Gemology Project
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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