Spessartine Garnet
Rutherford Mine
Amelia, Virginia
This specimen measures 10cm x 6.5cm x 7cm
Garnet group
Mg3Al2Si3O12(pyrope)
Fe3Al2Si3O12(almandine)
Mn3Al2Si3O12(spessartine)
Ca3Al2Si3O12(grossular)
Ca3Fe2Si3O12(andradite)
Ca3Cr2Si3O12(uvarovite)
Nesosilicates; aluminum and calcium silicates
Color and Luster: Vitreous; colorless streak
Pyrope is a deep red to reddish black,
(Var. Rhodolite) is a puple or rose to pale purplish red
Almandine is a deep red to brown, brownish black
Spessartine is a brownish red to hyacinth-red
Grossular is colorless, white, yellow, pink, green, or brown
Uvarovite is emerald green
Andradite is wine-red, greenish(Var. demantiod), yellow (Var. topazolite), brown, or black(Var. melanite)
Hardness: 6.5-7.5
Cleavage: None; parting sometimes distinct in six directions
Fracture: Conchoidal, uneven, brittle
Crystals: Isometeric; crystals very common as dodecahedrons and trapezohedrons; also granular, lamellar, compact, disseminated
Note: Aquired in 1994 from David Crawford (ex. M. Bixby Collection)
Photo by Mary Sutherland
Descriptions taken from
The Audubon Society Field Guide to North American Rocks and Minerals