Strontianite

Formula : SrCO3

Family: 
Carbonates
Space group: 
Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pmcn
Dana class: 
14.1.3.3 (14) Anhydrous Carbonates (14.1) with Simple Formula A+ CO3 (14.1.3) Aragonite Group (Orthorhombic: Pmcn)
High temperature: 
Low-temperature mineral.
Geological context: 
Strontianite is a rare carbonate mineral and one of only a few strontium minerals. Occurs as veins and geodes in limestone and marls, and as near-surface guangue minerals in sulfide vein deposits

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
147.629 39.010 (Ref.: 78hel/del) Helgeson, H.C., Delany, J.M, Nesbitt, H.W., and Bird, D.K., 1978. Summary and Critique of the Thermodynamic Properties of Rock Forming Minerals: Amer. J. Sci., 278A, 229 pp. -1144678 (Ref.: 84bus/plu) Busenberg E., Plummer L.N. and Parker V.B., 1984. The solubility of strontianite (SrCO3) in CO2-H2O solutions between 2 and 91C, the association constants of SrHCO3+(aq) and SrCO3O(aq) between 5 and 80C, and an evaluation of the thermodynamic properties of Sr++(aq) and SrCO3(cr) at 25C and 1 atm total pressure. Geochim. et Cosmochim. Acta, 48, p. 2021-2035. -1225763 (Ref.: Internal calculation) 97.200 (Ref.: 84bus/plu) Busenberg E., Plummer L.N. and Parker V.B., 1984. The solubility of strontianite (SrCO3) in CO2-H2O solutions between 2 and 91C, the association constants of SrHCO3+(aq) and SrCO3O(aq) between 5 and 80C, and an evaluation of the thermodynamic properties of Sr++(aq) and SrCO3(cr) at 25C and 1 atm total pressure. Geochim. et Cosmochim. Acta, 48, p. 2021-2035. 115.26 (Ref.: 06bla/ign) Blanc P., Ignatadis I., Lassin A. et Burnol A., 2006. Thermochimie : Selection de constantes thermodynamiques pour le chrome, le cobalt et le strontium. Rapport final. Rapport BRGM 55083-FR.
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.
115.26 0.00 0.00 (Ref.: 06bla/ign) Blanc P., Ignatadis I., Lassin A. et Burnol A., 2006. Thermochimie : Selection de constantes thermodynamiques pour le chrome, le cobalt et le strontium. Rapport final. Rapport BRGM 55083-FR.
Reaction properties

Strontianite + H+ ⇌ HCO3- + Sr+2

298.15 K, 1 bar log10K: 1.06 ΔH°r:-15067 J·mol-1 (Ref.: Internal calculation)
T(°C) 0 25 60 100 150 200 250 300
log10K 1.26 1.06 0.73 0.32 -0.22 -0.80 -1.47 -2.30
log10K(T) = A + B·T + C·T-1 + D·log10(T) + E·T−2 (T in Kelvin)
A B C D E
-864.481467 -0.139496 48173.733915 314.232739 -2844118.633561