Grossular

Grossular is a member of the garnet family. Please see the garnet page for images and videos.

The garnet family also includes almandine, pyrope, and spessartine.

Physical Properties
Chemical formula Ca3Al2Si3O12
Class Nesosilicate
Isolated tetrahedra
Crystal system Cubic
Habit Dodecahedral
Trapezohedral
Usually euhedral to subhedral
Color Pink
Brown
Yellow
Green
Hardness 6.5
Specific gravity 3.56
Cleavage None
Fracture Subconchoidal
Luster Resinous
Transparency Transparent to translucent
Streak White
Optical Properties
PPL High relief
Colorless to very pale
May appear mottled grey
XPL Isotropic
δ None
after Perkins, 339

Further Reading

Grossular at webmineral.com

Grossular at mindat.org