Monticellite

Formula : CaMgSiO4

Family: 
Space group: 
Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: P nma
Dana class: 
51.3.2.1 (51) Nesosilicate Insular SiO4 Groups Only (51.3)with all cations in octahedral [6] coordination (51.3.2) Monticellite - Kirschsteinite series
High temperature: 
More than 340C and it melts incongruently at 1499C to form MgO and a liquid
Geological context: 
Occurs in banded iron formations subjected to low-grade regional metamorphism and in MgO riche skarn. Monticellite is also present in kimberlites and in smelting byproducts.

Dernière mise à jour le 25.01.2021

THERMODYNAMICS

Reaction properties

Monticellite + 4H+ ⇌ Ca+2 + Mg+2 + H4SiO4

298.15 K, 1 bar log10K: 30.09 ΔH°r:-206036 J·mol-1 (Ref.: Internal calculation)
T(°C) 0 25 60 100 150 200 250 300
log10K 33.36 30.09 26.28 22.80 19.36 16.61 14.30 12.24