Rozenite

Formula : FeSO4:4H2O

Family: 
Sulfates
Space group: 
Monoclinic - Prismatic HM symbol (2/m) Space Group: P 21/n
Dana class: 
29.6.6.1VI- 29 Hydrated Acid and Sulfates ; 29.6 Hydrated Acid and Sulfates where A XO4 . x(H2O) ; 29.6.6 Rozenite Group (Monoclinic)

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
223.972 96.500 (Ref.: 90rob/cam) Roberts, Willard L., Campbell, Thomas J., and Rapp, George R.: Encyclopedia of Minerals. (Van Nostrand Reinhold Co., 2nd ed., 1990) -1792800 (Ref.: 02cho/sea) Chou, I.M., Seal, R.R., Hemingway, B.S. (2002) Determination of melanterite-rozenite and chalcanthite-bonattite equilibria by humidity measurements at 0.1 MPa, Am. Mineral. 87, 108-114. -2127700 (Ref.: 02cho/sea) Chou, I.M., Seal, R.R., Hemingway, B.S. (2002) Determination of melanterite-rozenite and chalcanthite-bonattite equilibria by humidity measurements at 0.1 MPa, Am. Mineral. 87, 108-114. 279.442 (Ref.: Internal calculation)
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

Rozenite ⇌ Fe+2 + SO4-2 + 4H2O

298.15 K, 1 bar log10K: -1.70 ΔH°r:-14960 J·mol-1 (Ref.: 02cho/sea) Chou, I.M., Seal, R.R., Hemingway, B.S. (2002) Determination of melanterite-rozenite and chalcanthite-bonattite equilibria by humidity measurements at 0.1 MPa, Am. Mineral. 87, 108-114.
T(°C) 0 25 60 100 150 200 250 300
log10K -1.46 -1.70 -1.96 -2.15 -2.31 -2.48 -2.77 -3.36
log10K(T) = A + B·T + C·T-1 + D·log10(T) + E·T−2 (T in Kelvin)
A B C D E
-1762.790922 -0.259975 96675.812232 636.752855 -5444656.541543