Yavapaiite

Formula : KFe(SO4)2

Family: 
Sulfates
Space group: 
Monoclinic - Prismatic HM symbol (2/m) Space Group: C 2/m
Dana class: 
28.3.4.1VI- 28 Sulfate Minerals ; 28.3 Anhydrous Acid and Sulfates (A++) XO4 ; 28.3.2

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
287.073 99.300 (Ref.: 90rob/cam) Roberts, Willard L., Campbell, Thomas J., and Rapp, George R.: Encyclopedia of Minerals. (Van Nostrand Reinhold Co., 2nd ed., 1990) -1818586 (Ref.: Internal calculation) -2042800 (Ref.: 05for/dro) Forray, F.L., Drouet, C, Navrotsky, A. (2005) Thermochemistry of yavapaiite KFe(SO4)2: Formation and decomposition. Geochimica et Cosmochimica Acta 69(8), 2133-2140 224.700 (Ref.: 05for/dro) Forray, F.L., Drouet, C, Navrotsky, A. (2005) Thermochemistry of yavapaiite KFe(SO4)2: Formation and decomposition. Geochimica et Cosmochimica Acta 69(8), 2133-2140
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.
Reaction properties

Yavapaiite ⇌ Fe+3 + K+ + 2SO4-2

298.15 K, 1 bar log10K: -5.57 ΔH°r:-77020 J·mol-1 (Ref.: 05for/dro) Forray, F.L., Drouet, C, Navrotsky, A. (2005) Thermochemistry of yavapaiite KFe(SO4)2: Formation and decomposition. Geochimica et Cosmochimica Acta 69(8), 2133-2140
T(°C) 0 25 60 100 150 200 250 300
log10K -4.47 -5.57 -7.14 -8.88 -10.98 -13.12 -15.48 -18.41
log10K(T) = A + B·T + C·T-1 + D·log10(T) + E·T−2 (T in Kelvin)
A B C D E
-3318.972682 -0.520213 185901.575694 1199.090032 -10852279.006456