Grossular Mineral Data
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General Grossular Information
Chemical Formula:
Ca3Al2(SiO4)3
Composition:
Molecular Weight = 450.45 gm
Calcium
26.69 % Ca 37.35 % CaO
Aluminum
11.98 % Al 22.64 % Al
2
O
3
Silicon
18.71 % Si 40.02 % SiO
2
Oxygen
42.62 % O
______ ______
100.00 % 100.00 % = TOTAL OXIDE
Empirical Formula:
Ca
3
Al
2
(SiO
4
)
3
Environment:
Contact metasomatic deposits.
IMA Status:
Valid Species (Pre-IMA) 1811
Locality:
Isle of Mull, Scotland. Link to 
MinDat.org
Location Data.
Name Origin:
Grossular is from the Latin grossularia meaning "gooseberry." Hessonite is from the Greek hesson, meaning "slight" in reference to the smaller specific gravity.
Name Pronunciation:
Grossular
+ Pronunciation
Synonym:
Grossularite
Hessonite - brownish orange
ICSD 24944
PDF 39-368
Tsavorite - emerald green