Halotrichite

Formula : FeAl2(SO4)4:22H2O

Family: 
Sulfates
Space group: 
Monoclinic - Sphenoidal HM symbol (2) Space Group: P 2
Dana class: 
29.7.3.2VI- 29 Hydrated Acid and Sulfates ; 29.7 Hydrated Acid and Sulfates where A(?)2 (XO4)4 . x(H2O) ; 29.7.3 Halotrichite Group (Monoclinic with 22 H2O)

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
890.401 546.600 (Ref.: 90rob/cam) Roberts, Willard L., Campbell, Thomas J., and Rapp, George R.: Encyclopedia of Minerals. (Van Nostrand Reinhold Co., 2nd ed., 1990) -9306070 (Ref.: Internal calculation) -11041000 (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. 1166.000 (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

Halotrichite ⇌ 2Al+3 + Fe+2 + 4SO4-2 + 22H2O

298.15 K, 1 bar log10K: -8.24 ΔH°r:-51420 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 -7.38 -8.24 -9.04 -9.41 -9.47 -9.51 -10.02 -11.71
log10K(T) = A + B·T + C·T-1 + D·log10(T) + E·T−2 (T in Kelvin)
A B C D E
-7060.860498 -1.030268 384951.377578 2549.844374 -21402056.135275