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Hydrogrossular is a calcium aluminium garnet series (formula: Ca3Al2(SiO4)3−x(OH)4x, with hydroxide (OH) partially replacing silica (SiO4)). The endmembers of the hydrogarnet family (grossular, hibschite, and katoite) depend on the degree of substitution (x):
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green pink white gray color garnet idocrase site found sometimes massive formula ca3al2 sio4 oh 4x crystal habit bluish may
| Subject | Predicate | Object | Confidence | Src |
|---|---|---|---|---|
| Hydrogrossular | Absorption spectra | dark green hydrogrossular often shows cutoff below 460 nm. Other color stones may show line around 463 nm, indicating some idocrase content | 1.00 | infobox |
| Hydrogrossular | Birefringence | none | 1.00 | infobox |
| Hydrogrossular | Category | Nesosilicate | 1.00 | infobox |
| Hydrogrossular | Cleavage | none | 1.00 | infobox |
| Hydrogrossular | Color | green to bluish green, pink, white, gray | 1.00 | infobox |
| Hydrogrossular | Crystal habit | Massive | 1.00 | infobox |
| Hydrogrossular | Crystal system | Cubic | 1.00 | infobox |
| Hydrogrossular | Formula | Ca3Al2(SiO4)3−x(OH)4x | 1.00 | infobox |
| Hydrogrossular | Fracture | conchoidal | 1.00 | infobox |
| Hydrogrossular | IMA symbol | Hgrs | 1.00 | infobox |
| Hydrogrossular | Luster | vitreous | 1.00 | infobox |
| Hydrogrossular | Mohs scale hardness | 7–7.5 | 1.00 | infobox |
| Hydrogrossular | Optical properties | single refractive, anomalous aggregate reaction | 1.00 | infobox |
| Hydrogrossular | Pleochroism | none | 1.00 | infobox |
| Hydrogrossular | Polish luster | vitreous to subadamantine | 1.00 | infobox |
| Hydrogrossular | References | Gemological Institute of America | 1.00 | infobox |
| Hydrogrossular | Refractive index | 1.810+0.004 −0.020 | 1.00 | infobox |
| Hydrogrossular | Specific gravity | 4.15+0.05 −0.03 | 1.00 | infobox |
| Hydrogrossular | Ultraviolet fluorescence | inert | 1.00 | infobox |
| Hydrogrossular | is a | calcium aluminium garnet series | 0.90 | text |
| Hydrogrossular | is a | garnet variety in which a Si4 | 0.90 | text |
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