Romerite

Formula : Fe3(SO4)4:14H2O

Family: 
Sulfates
Space group: 
Triclinic Pedial or Pinacoidal HM symbol (1 or -1) Space Group: P1
Dana class: 
29.7.2.1VI- 29 Hydrated Acid and Sulfates ; 29.7 Hydrated Acid and Sulfates where A(?)2 (XO4)4 . x(H2O) ; 29.7.2

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
804.009 370.500 (Ref.: 90rob/cam) Roberts, Willard L., Campbell, Thomas J., and Rapp, George R.: Encyclopedia of Minerals. (Van Nostrand Reinhold Co., 2nd ed., 1990) -6485529 (Ref.: Internal calculation) -7730000 (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. 943.000 (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

Romerite ⇌ 2Fe+3 + 4SO4-2 + Fe+2 + 14H2O

298.15 K, 1 bar log10K: -11.63 ΔH°r:-96980 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 -10.14 -11.63 -13.42 -15.01 -16.63 -18.24 -20.29 -23.50
log10K(T) = A + B·T + C·T-1 + D·log10(T) + E·T−2 (T in Kelvin)
A B C D E
-7014.386113 -1.047941 385815.484599 2532.229363 -21749258.982747