Sellaite

Formula : MgF2

High temperature: 
Hydrothermal
Geological context: 
In bituminous dolomite-anhydrite rocks, and at Mt Vesiuvius associated with anhydrite, and a Carrara in cavities with gypsum. Probably of an hydrothermal origin.

Dernière mise à jour le 11.06.2018

THERMODYNAMICS

Individual properties (298.15 K)
M
g·mol-1
cm3·mol-1
ΔGºf
J·mol-1
ΔHºf
J·mol-1
J·mol-1·k-1
CP
J·mol-1·K-1
62.302 19.790 -1071051 -1124200 57.200 61.51
Reaction properties

Sellaite ⇌ 2F- + Mg+2

298.15 K, 1 bar log10K: -9.22 ΔH°r: -13500 J·mol-1
T(°C) 0 25 60 100 150 200 250 300
log10K -9.07 -9.22 -9.55 -10.02 -10.70 -11.52 -12.54 -13.91