Grossular
Grossularite Garnet tumbled
A variety of Hydrogrossular
What is Grossular?
Although Garnet crystals are usually very small, some grossulars can be quite massive. These larger crystals are suitable for cutting and polishing so they're commonly turned into wonderful faceted gems, beads, or tumbled stones. The massive crystals of grossular from South Africa are known as Transvaal Jade.
Optical Properties
- Refractive Index
- 1.680-1.712
- Optical Character
- Isotropic
- Dispersion
- 0.02
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Grossular before comparing listings or appraisals.
Size & Weight
Larger, intact specimens usually command higher prices.
Rarity & Demand
Scarce material or popular varieties sell at a premium.
Condition & Finish
Chips, repairs, and heavy wear lower value; clean prep helps.
Treatment & Provenance
Untreated specimens with documented locality are prized.
Grossular Localities Map
See where Grossular is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
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Quick Facts
Physical Properties
- Color
- Colorless, white, green, yellow, orange, cinnamon-brown, pale red, occasionally pink
- Streak
- White
Chemical Properties
- Chemical Formula
- Ca3Al2(SiO4)3
- Elements
- Al, Ca, O, Si
Also Known As
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Grossular FAQs
How do I identify Grossular?
Grossular can be identified by its Colorless color. Look for these key characteristics when examining specimens.
What color is Grossular?
Grossular typically appears in Colorless, white, green, yellow, orange, cinnamon-brown, pale red, occasionally pink. Color can vary depending on impurities and formation conditions.