Hydrogrossular
A variety of Grossular Garnet
What is Hydrogrossular?
Hydrogrossular is a garnet variety that is different from the other garnets in that it is never transparent. Its most common color is a bluish green. It can be cut into various gems, although it is not used as extensively as the other types of garnets. Hydrogrossular is sometimes used for cabuchons or made into beads.
Optical Properties
- Refractive Index
- 1.680-1.712
- Optical Character
- Isotropic
- Dispersion
- 0.02
Discover Values
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Hydrogrossular 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.
Hydrogrossular Localities Map
See where Hydrogrossular is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Quick Facts
Physical Properties
- Color
- Green to bluish green, greenish yellow, pink, white, colorless, and gray
- Hardness (Mohs)
- 7 - 7.5
- Density
- 3.25 - 3.4 g/cm³
- Streak
- White
- Luster
- Vitreous
- Crystal System
- Isometric
Chemical Properties
- Chemical Formula
- Ca3Al2(SiO4 )3-x (OH)4x - where 0 < x < 1.5
- Elements
- Al, Ca, O, Si
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Hydrogrossular FAQs
How do I identify Hydrogrossular?
Hydrogrossular can be identified by its hardness of 7 - 7.5 on the Mohs scale, Green to bluish green color, Vitreous luster, Isometric crystal system. Look for these key characteristics when examining specimens.
What color is Hydrogrossular?
Hydrogrossular typically appears in Green to bluish green, greenish yellow, pink, white, colorless, and gray. Color can vary depending on impurities and formation conditions.
How hard is Hydrogrossular?
Hydrogrossular has a hardness of 7 - 7.5 on the Mohs scale. This makes it a relatively hard mineral suitable for jewelry.
