Wurtzite

Formula : ZnS

Family: 
Sulfides
Space group: 
Hexagonal - Dihexagonal Pyramidal H-M Symbol (6mm) Space Group: P 63mc
Dana class: 
2.8.7.1 (2) Sulfides - Including Selenides and Tellurides (2.8) where Am Bn Xp, with (m+n): p=1:1 (2.8.7) Wurtzite Group (Hexagonal: P63mc)
High temperature: 
The stability temperatures of this mineral ranges fromthose of hydrothermal systems to temperatures compatible with slag melting.
Geological context: 
Present in sulfide ore veins in all rock classes, is an hydrothermal mineral

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
97.456 23.846 (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. -187485 (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. -191936 (Ref.: Internal calculation) 58.844 (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. 46.01 (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.
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.
49.45 4.85 -4.35 (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.
Reaction properties

Wurtzite + H+ ⇌ HS- + Zn+2

298.15 K, 1 bar log10K: -9.20 ΔH°r:22250 J·mol-1 (Ref.: Internal calculation)
T(°C) 0 25 60 100 150 200 250 300
log10K -9.59 -9.20 -8.83 -8.58 -8.45 -8.50 -8.74 -9.23
log10K(T) = A + B·T + C·T-1 + D·log10(T) + E·T−2 (T in Kelvin)
A B C D E
-971.403975 -0.154424 51494.768172 351.773546 -3103042.609949