Pyrosilicate

Pyrosilicate anion
Names
	IUPAC name Pyrosilicate
	Other names disilicate, diorthosilicate
Identifiers
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:29380 ;
ChemSpider	5257009 ;
Gmelin Reference	326578
PubChem CID	6857674;
	InChI InChI=1S/O7Si2/c1-8(2,3)7-9(4,5)6/q-6 Key: KUDCBYUNCUYIDU-UHFFFAOYSA-N ;
	SMILES [O-][Si]([O-])([O-])O[Si]([O-])([O-])[O-];
Properties
Chemical formula	O7Si2−6
Molar mass	168.166 g·mol−1
Conjugate acid	Pyrosilicic acid
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). (what is ?) Infobox references

A pyrosilicate is a type of chemical compound; either an ionic compound that contains the pyrosilicate anion Si
₂O⁶⁻
₇, or an organic compound with the hexavalent ≡O
₃Si-O-SiO
₃≡ group. The anion is also called disilicate or diorthosilicate.

Ionic pyrosilicates can be considered salts of the unstable pyrosilicic acid, H
₆Si
₂O
₇. Unlike the acid, the salts can be stable. Indeed, pyrosilicates occur widely in nature as a class of silicate minerals, specifically the sorosilicates.

Some notable synthetic pyrosilicates include

sodium pyrosilicate Na
₆Si
₂O
₇, a possible component of water glass.
sodium iron(II) pyrosilicate Na
₂Fe
₂Si
₂O
₇, a potential cathode material for batteries.
sodium manganese(II) pyrosilicate Na
₂Mn
₂Si
₂O
₇, another potential cathode material.

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