hydrogrossular
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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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- mineral group
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- garnet group
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- Hydrogrossulaar.jpg
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- IMA Mineral Symbol
- Hgrs
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- Hydrogrossular
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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): grossular: x = 0 hibschite: 0.2 4+ is missing from a tetrahedral site. Charge balance is maintained by bonding a H+ to each of the four oxygens surrounding the vacant site.
Hydrogrossular is found in massive crystal habit, sometimes grown in with idocrase.
Excerpted from Wikipedia’s “hydrogrossular” article, available under the CC BY-SA 4.0 licence.