Sodium pyrosilicate
Sodium pyrosilicate
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Sodium pyrosilicate

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Sodium pyrosilicate

Sodium pyrosilicate is the chemical compound Na
6
Si
2
O
7
. It is one of the sodium silicates, specifically a pyrosilicate, formally a salt of the unstable pyrosilicic acid H
6
Si
2
O
7
.

The anhydrous solid has the triclinic crystal structure. The Si
2
O6−
7
anions are arranged in layers parallel to the (100) plane, with the sodium cations distributed in 24 distinct crystallographic positions, coordinated by 4 to 6 near oxygen atoms. Some of the 4-coordinated sodium atoms can be interpreted as parallel columns of edge-sharing NaO
4
tetrahedra. The columnar arrangement forms tunnels that house the remaining sodium cations. Twinning at a microscopic scale simulates a much larger monoclinic C centered lattice (V′ = 6220 Å3, Z = 32).

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