Hydrogrossular differs from the other garnets in that it is never transparent. It ranges from translucent to opaque. The most common color is a bluish green, but they are also found in pink, white, and gray.
Hydrogrossular Value
The International Gem Society (IGS) has a list of businesses offering gemstone appraisal services.
Hydrogrossular Information
| Data | Value |
| Name | Hydrogrossular |
| Is a Variety of | Grossular |
| Crystallography | Isometric |
| Refractive Index | 1.72 - 1.80 |
| Hardness | 6.5 - 7.5 |
| Specific Gravity | 3.40- 3.70 |
| Cleavage | None |
| Dispersion | 0.028 |
| Heat Sensitivity | Some |
| Formula | Ca3Al2(SiO4)3-x(OH)4 |
Hydrogrossular differs from the other garnets in that it is never transparent. It ranges from translucent to opaque. The most common color is a bluish green, but they are also found in pink, white, and gray.
Because of its coloring and translucency, hydrogrossular is often used as a jade substitute. Large pieces are available, which lend themselves to carving.
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