Smithsonite

Formula : ZnCO3

Family: 
Carbonates
Space group: 
Trigonal - Hexagonal Scalenohedral H-M Symbol (3 2/m) Space Group: R 3c
Dana class: 
14.1.1.6 (14) Anhydrous Carbonates (14.1) with Simple Formula A+ CO3 (14.1.1) Calcite Group (Trigonal: R3c)
High temperature: 
Stable at room temperature.
Geological context: 
Commonly found as an oxidation product of Zn-bearing ores.

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
125.399 28.275 (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. -737611 (Ref.: 13pow/bro) Powell, K.J., Brown, P.L., Byrne, R.H., Gajda, T., Hefter, G., Leuz, A.-K., Sjoberg, S., Wanner, H., 2013. Chemical speciation of environmentally significant metals with inorganic ligands. Part 5: The Zn2++ OH-, Cl-, CO32-, SO42-, and PO43-systems (IUPAC Technical Report). Pure and Applied Chemistry 85, 2249-2311. -818900 (Ref.: 13pow/bro) Powell, K.J., Brown, P.L., Byrne, R.H., Gajda, T., Hefter, G., Leuz, A.-K., Sjoberg, S., Wanner, H., 2013. Chemical speciation of environmentally significant metals with inorganic ligands. Part 5: The Zn2++ OH-, Cl-, CO32-, SO42-, and PO43-systems (IUPAC Technical Report). Pure and Applied Chemistry 85, 2249-2311. 82.539 (Ref.: Internal calculation) 80.07 (Ref.: 18las/bla) Lassin, A., Blanc, P., 2018. Thermoddem : selection des proprietes thermodynamiques des complexes aqueux et des mineraux porteurs de zinc, p. 42.
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.
71.44 66.76 -10.02 (Ref.: 18las/bla) Lassin, A., Blanc, P., 2018. Thermoddem : selection des proprietes thermodynamiques des complexes aqueux et des mineraux porteurs de zinc, p. 42.
Reaction properties

Smithsonite + H+ ⇌ HCO3- + Zn+2

298.15 K, 1 bar log10K: -0.62 ΔH°r:-24415 J·mol-1 (Ref.: 13pow/bro) Powell, K.J., Brown, P.L., Byrne, R.H., Gajda, T., Hefter, G., Leuz, A.-K., Sjoberg, S., Wanner, H., 2013. Chemical speciation of environmentally significant metals with inorganic ligands. Part 5: The Zn2++ OH-, Cl-, CO32-, SO42-, and PO43-systems (IUPAC Technical Report). Pure and Applied Chemistry 85, 2249-2311.
T(°C) 0 25 60 100 150 200 250 300
log10K -0.26 -0.62 -1.11 -1.62 -2.24 -2.87 -3.57 -4.43
log10K(T) = A + B·T + C·T-1 + D·log10(T) + E·T−2 (T in Kelvin)
A B C D E
-923.012845 -0.147731 50911.224569 334.714331 -2893204.359182