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are hydrates with the formula Na₂SiO₃·nH₂O (where n = 5, 6, 8, 9), which contain the discrete, approximately tetrahedral anion SiO₂(OH)₂^2- with water of hydration. For example, the commercially available sodium silicate pentahydrate Na₂SiO₃·5H₂O is formulated as Na₂SiO₂(OH)₂·4H₂O, and the nonahydrate Na₂SiO₃·9H₂O is formulated as Na₂SiO₂(OH)₂·8H₂O.

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