Jarosite(H)

Formula : (H3O)Fe3(SO4)2(OH)6

Family: 
Alunite
Space group: 
Trigonal - Rhombohedral or Pyramidal HM symbol (3 or -3) Space Group: R 3
Dana class: 
30.2.5.1VI- 30 Anhydrous Sulfates Containing Hydroxyl or Halogen ; 30.2 Anhydrous Sulfates Containing Hydroxyl or Halogen where (A B)2 XO4 Zq ; 30.2.5 Alunite Group (Jarosite Subgroup)

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
480.735 147.900 (Ref.: 90rob/cam) Roberts, Willard L., Campbell, Thomas J., and Rapp, George R.: Encyclopedia of Minerals. (Van Nostrand Reinhold Co., 2nd ed., 1990) -3226205 (Ref.: Internal calculation) -3770200 (Ref.: 04maj/ste) Majzlan, J., Stevens, R., Boerio-Goates, J., Woodfield, B.F., Navrotsky, A., Burns, P.C., Crawford, M.K., Amos, T.G. (2004) Thermodynamic properties, low-temperature heat capacity anomalies, and single crystal X-ray refinement of hydronium jarosite, (H3O)Fe3(SO4)2(OH)6. Physics and Chemistry of Minerals 31, 518-531 448.200 (Ref.: 04maj/ste) Majzlan, J., Stevens, R., Boerio-Goates, J., Woodfield, B.F., Navrotsky, A., Burns, P.C., Crawford, M.K., Amos, T.G. (2004) Thermodynamic properties, low-temperature heat capacity anomalies, and single crystal X-ray refinement of hydronium jarosite, (H3O)Fe3(SO4)2(OH)6. Physics and Chemistry of Minerals 31, 518-531 437.50 (Ref.: 04maj/ste) Majzlan, J., Stevens, R., Boerio-Goates, J., Woodfield, B.F., Navrotsky, A., Burns, P.C., Crawford, M.K., Amos, T.G. (2004) Thermodynamic properties, low-temperature heat capacity anomalies, and single crystal X-ray refinement of hydronium jarosite, (H3O)Fe3(SO4)2(OH)6. Physics and Chemistry of Minerals 31, 518-531
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.
287.20 628.10 -32.86 (Ref.: 04maj/ste) Majzlan, J., Stevens, R., Boerio-Goates, J., Woodfield, B.F., Navrotsky, A., Burns, P.C., Crawford, M.K., Amos, T.G. (2004) Thermodynamic properties, low-temperature heat capacity anomalies, and single crystal X-ray refinement of hydronium jarosite, (H3O)Fe3(SO4)2(OH)6. Physics and Chemistry of Minerals 31, 518-531
Reaction properties

Jarosite(H) + 5H+ ⇌ 3Fe+3 + 2SO4-2 + 7H2O

298.15 K, 1 bar log10K: -5.14 ΔH°r:-196290 J·mol-1 (Ref.: 04maj/ste) Majzlan, J., Stevens, R., Boerio-Goates, J., Woodfield, B.F., Navrotsky, A., Burns, P.C., Crawford, M.K., Amos, T.G. (2004) Thermodynamic properties, low-temperature heat capacity anomalies, and single crystal X-ray refinement of hydronium jarosite, (H3O)Fe3(SO4)2(OH)6. Physics and Chemistry of Minerals 31, 518-531
T(°C) 0 25 60 100 150 200 250 300
log10K -2.14 -5.14 -8.93 -12.74 -17.01 -21.07 -25.25 -30.02
log10K(T) = A + B·T + C·T-1 + D·log10(T) + E·T−2 (T in Kelvin)
A B C D E
-4261.081677 -0.682686 238084.581209 1539.866075 -13276428.889434