Ferrosilite(alpha)

Formula : FeSiO3

Family: 
Pyroxenes
Space group: 
Orthorhombic - Dipyramidal HM symbol (2/m 2/m 2/m) Space Group: P bca
Dana class: 
65.1.2.2VIII- 65 Inosilicate Minerals ; 65.1 Inosilicates Inosilicate Single-Width Unbranched Chains, W=1 with chains P=2 ; 65.1.2 Orthopyroxenes

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
131.931 32.952 (Ref.: 78hel/del,85hel) -1116673 (Ref.: Internal calculation) -1195193 (Ref.: 78hel/del,85hel) 90.500 (Ref.: 78hel/del,85hel) 91.04 (Ref.: 78hel/del,85hel)
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.
110.83 21.21 -23.22 (Ref.: 78hel/del,85hel)
Reaction properties

Ferrosilite(alpha) + 2H+ + H2O ⇌ Fe+2 + H4SiO4

298.15 K, 1 bar log10K: 8.05 ΔH°r:-67838 J·mol-1 (Ref.: 78hel/del,85hel)
T(°C) 0 25 60 100 150 200 250 300
log10K 9.10 8.05 6.78 5.59 4.41 3.44 2.62 1.84
log10K(T) = A + B·T + C·T-1 + D·log10(T) + E·T−2 (T in Kelvin)
A B C D E
-665.658713 -0.091072 42608.236405 236.692546 -2464478.600023