Orthosilicate

[2] Olivine, a magnesium or iron(II) orthosilicate, is the most abundant mineral in the upper mantle.

This equilibrium is difficult to study since the acid tends to decompose into a hydrated silica condensate.

[5] In organic compounds like tetramethyl orthosilicate, each oxygen is formally neutral and is connected to the rest of the molecule by a single covalent bond.

Europium doped barium orthosilicate (Ba2SiO4) is a common phosphor used in green light-emitting diodes (LEDs).

Two silicate compounds, however, are used in organic synthesis: tetraethyl orthosilicate or TEOS is used to link polymers, and is especially important in the manufacture of aerogels.