Fluorphlogopite

Formula : KMg3(AlSi3)O10(F)2

Space group: 
Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/m
Dana class: 
71.2.2b.1 (71) Phyllosilicate Sheets of Six-Membered Rings (71.2)with 2:1 Layers (71.2.2b)Mica Group (Biotite subgroup)
High temperature: 
Medium to high temperature mineral, 650C C is a temperature estimated from a deposit.
Geological context: 
Occurs commonly in high-grade metamorphic environment- Ultramafic igneous rocks, lava fissures and breccias, contact and regional metamorphic limestones and dolomites.

Dernière mise à jour le 25.01.2021

THERMODYNAMICS

Individual properties (298.15 K)
M
g·mol-1
 V°
cm3·mol-1
 ΔGºf
J·mol-1
 ΔHºf
J·mol-1
 Sº
J·mol-1·k-1
 CP
J·mol-1·K-1
421.242 146.370 (Ref.: 78hel/del,78rob/hem) -6015710 (Ref.: Internal calculation) -6355500 (Ref.: 95rob/hem) Robie R.A., and Hemingway B.S., 1995. Thermodynamic properties of minerals and related substances at 298.15 K and 1 Bar (105 Pascals) pressure and at higher temperatures. U.S. Geol. Survey Bull., 2131, 461 pp. 336.310 (Ref.: 78hel/del,78rob/hem) 339.50 (Ref.: 78hel/del,78rob/hem)
CP(T) = a + b·T + ·c·T-2 (T in Kelvin)
a
J·mol-1·K-1
 b * 103
J·mol-1·K-2
 c * 10-5
J·K·mol-1
 Maier Kelley Ref.
402.21 111.88 -85.40 (Ref.: 78hel/del,78rob/hem)
Reaction properties

Fluorphlogopite + 8H+ + 2H2O ⇌ Al+3 + 2F- + K+

298.15 K, 1 bar log10K: 24.02 ΔH°r:-311663 J·mol-1 (Ref.: 95rob/hem) Robie R.A., and Hemingway B.S., 1995. Thermodynamic properties of minerals and related substances at 298.15 K and 1 Bar (105 Pascals) pressure and at higher temperatures. U.S. Geol. Survey Bull., 2131, 461 pp.
T(°C) 0 25 60 100 150 200 250 300
log10K 28.82 24.02 18.12 12.52 6.73 1.79 -2.77 -7.39
log10K(T) = A + B·T + C·T-1 + D·log10(T) + E·T−2 (T in Kelvin)
A B C D E
-3942.572977 -0.583233 237656.574515 1412.416526 -13472306.593300