hydrogarnet

mineral

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June 29, 2026

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Hydrogarnet is a mineral belonging to a group of minerals with the general formula A₃B₂(SiO₄)₃₋ₓ(OH)₄ₓ. These minerals are isomorphous with various garnets. Garnets themselves are common silicate minerals with similar crystal structures and chemical compositions, and they can be found in a range of colors, including shades of red and green.12

Hydrogarnets are essentially a type of garnet where some of the silicate (SiO₄) groups are replaced by hydroxyl (OH) groups. This substitution leads to a variation in their chemical makeup compared to standard garnets.12

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garnet
Chemical composition
Other hydrogarnets have been reported—e.g., hydroandradite and hydrospessartine; the general formula for hydrogarnets would be A₃B₂(SiO₄)_{3 - x}(H₄O₄)_x, and the general formula for an end-member hydrogarnet would be A₃B₂(H₄O₄)₃.
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Other hydrogarnets have been reported—e.g., hydroandradite and hydrospessartine; the general formula for hydrogarnets would be A₃B₂(SiO₄)_{3 - x}(H₄O₄)_x, and the general formula for an end-member hydrogarnet would be A₃B₂(H₄O₄)₃.
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