# Orthosilicate

Mineral group also called “nesosilicate,” containing isolated SiO4 tetrahedra that are bound by interstitial cations. Their structures are usually closely packed resulting in high density and hardness, with fairly uniform properties in all crystallographic directions. Substitution of Al3+ for Si4+ is generally low. The most common othosilicate is olivine, which is ubiquitous in terrestrial and extraterrestrial rocks. Also common are garnet, aluminosilicates, zircon and titanite (sphene).

Some or all content above used with permission from J. H. Wittke.

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