Grossular is a mineral, a calcium-aluminum variety of the mineral garnet. It was opened in Russia, in Yakutia. It has the following varieties:
Hessonite - brown, yellow,
Rosolite - pink
Tsavorite - green
Hydrogrossular is the unifying name for water-bearing garnets.
You can see grossular stone for sale and buy it in the Minerals of Russia online store.
General | |
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Category | Nesosilicate |
Formula (repeating unit) |
Ca3Al2(SiO4)3 |
IMA symbol | Grs |
Strunz classification | 9.AD.25 |
Crystal system | Cubic |
Crystal class | Hexoctahedral (m3m) H-M Symbol: (4/m 3 2/m) |
Space group | Ia3d |
Identification | |
Color | light to dark green, light to dark yellow to reddish brown, brown, orange, red, yellow, green, white, occasionally translucent to opaque pink. It is also but rarely found in colorless form |
Cleavage | none |
Fracture | conchoidal to uneven |
Mohs scale hardness | 6.5 to 7 |
Luster | greasy to vitreous |
Streak | Brown |
Specific gravity | 3.61 (+.15 -.04) |
Polish luster | vitreous |
Optical properties | Single refractive, often anomalous double refractive[2] |
Refractive index | 1.740 (+.12 -.04) |
Birefringence | none |
Pleochroism | none |
Dispersion | .028 |
Ultraviolet fluorescence | near colorless to light green – inert to weak orange in longwave and weak yellow-orange in shortwave; yellow – inert to weak orange in longwave and shortwave[2] |
Absorption spectra | Hessonite sometimes shows bands at 407 and 430nm |
Major varieties | |
Hessonite | yellow-red to reddish-orange |
Tsavorite | intense green to yellowish green |
Leuco-garnet | transparent and colorless[3] |
Rosolite | translucent to opaque pink grossularite crystals in marble from Mexico |