Coquimbite

Formula : Fe2(SO4)3:9H2O

Family: 
Sulfates
Space group: 
Trigonal - Hexagonal Scalenohedral HM symbol (-3 2/m) Space Group: P 3c
Dana class: 
29.8.3.1VI- 29 Hydrated Acid and Sulfates ; 29.8 Hydrated Acid and Sulfates where(?)2 (XO4)3 . x(H2O) ; 29.8.1

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
562.022 265.100 (Ref.: 90rob/cam) Roberts, Willard L., Campbell, Thomas J., and Rapp, George R.: Encyclopedia of Minerals. (Van Nostrand Reinhold Co., 2nd ed., 1990) -4450125 (Ref.: Internal calculation) -5288200 (Ref.: 02hem/sea) Hemingway, B.S., Seal, R.R., II, and Chou, I-M. (2002) Thermodynamic data for modeling acid mine drainage problems. Part I. Selected soluble iron-sulfate minerals. U.S. Geological Survey Open File Report 02 - 161, 13 p. 670.100 (Ref.: 02hem/sea) Hemingway, B.S., Seal, R.R., II, and Chou, I-M. (2002) Thermodynamic data for modeling acid mine drainage problems. Part I. Selected soluble iron-sulfate minerals. U.S. Geological Survey Open File Report 02 - 161, 13 p.
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

Coquimbite ⇌ 2Fe+3 + 3SO4-2 + 9H2O

298.15 K, 1 bar log10K: -8.98 ΔH°r:-110290 J·mol-1 (Ref.: 02hem/sea) Hemingway, B.S., Seal, R.R., II, and Chou, I-M. (2002) Thermodynamic data for modeling acid mine drainage problems. Part I. Selected soluble iron-sulfate minerals. U.S. Geological Survey Open File Report 02 - 161, 13 p.
T(°C) 0 25 60 100 150 200 250 300
log10K -7.28 -8.98 -11.05 -12.99 -15.04 -17.00 -19.22 -22.25
log10K(T) = A + B·T + C·T-1 + D·log10(T) + E·T−2 (T in Kelvin)
A B C D E
-5235.349090 -0.788919 289768.094294 1888.642736 -16322713.126607