Formula : MgSiO3

Space group: 
Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: P bca
Dana class: (65) Inosilicate Single-Width Unbranched Chains, W=1 (65.1) with chains P=2 (65.1.2) Orthopyroxenes
High temperature: 
Enstatite is stable above around600C.
Geological context: 
Occurs in pyroxenites, peridotites, and dunites; in ultramafic inclusions in alkalic olivine basalts and kimberlite; in mafic volcanics, rarely in felsic volcanics. Characteristic of charnockites and the granulite metamorphic facies, in regionally metamorphosed rocks and metagabbros.Common in chondrite, achondrite, and stony-iron meteorites. Occurs also in slags from metal smelting.

Dernière mise à jour le 25.01.2021


T(°C) 0 25 60 100 150 200 250 300
log10K 13.30 11.84 10.11 8.52 6.96 5.72 4.67 3.73