Almandine

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

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

Physical Properties
Chemical formula Fe3Al2Si3O12
Class Nesosilicate
Isolated tetrahedra
Crystal system Cubic
Habit Dodecahedral
Trapezohedral
Usually euhedral to subhedral
Color Deep red
Hardness 7
Specific gravity 4.33
Cleavage None
Fracture Conchoidal
Luster Resinous
Transparency Transparent to translucent
Streak White
Optical Properties
PPL High relief
Non-pleochroic
Colorless, pale, or mottled grey
XPL Isotropic
δ None
after Perkins, 338

Almandine in Hand Sample

Glorious almandine porphyroblasts in a schist from Alaska

Further Reading

Almandine at webmineral.com

Almandine at mindat.org