Sphalerite

Formula : ZnS

Family: 
Sulfides
Space group: 
Isometric - Hextetrahedral H-M Symbol (4 3m) Space Group: F43m
Dana class: 
2.8.2.1 (2) Sulfides - Including Selenides and Tellurides (2.8) where Am Bn Xp, with (m+n): p=1:1(2.8.2)Sphalerite Group (Isometric: F43m)
High temperature: 
Hydrothermal mineral stable in wide range of temperature : around 100 to more than 300C.
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 23.830 (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. -198600 (Ref.: Internal calculation) -203107 (Ref.: 14aki/tag) Akinfiev, N., Tagirov, B., 2014. Zn in hydrothermal systems: thermodynamic description of hydroxide, chloride, and hydrosulfide complexes. Geochemistry International 52, 197-214. 58.655 (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. 45.76 (Ref.: 14aki/tag) Akinfiev, N., Tagirov, B., 2014. Zn in hydrothermal systems: thermodynamic description of hydroxide, chloride, and hydrosulfide complexes. Geochemistry International 52, 197-214.
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.
47.13 8.26 -3.41 (Ref.: 14aki/tag) Akinfiev, N., Tagirov, B., 2014. Zn in hydrothermal systems: thermodynamic description of hydroxide, chloride, and hydrosulfide complexes. Geochemistry International 52, 197-214.
Reaction properties

Sphalerite + H+ ⇌ HS- + Zn+2

298.15 K, 1 bar log10K: -11.15 ΔH°r:33421 J·mol-1 (Ref.: 14aki/tag) Akinfiev, N., Tagirov, B., 2014. Zn in hydrothermal systems: thermodynamic description of hydroxide, chloride, and hydrosulfide complexes. Geochemistry International 52, 197-214.
T(°C) 0 25 60 100 150 200 250 300
log10K -11.72 -11.15 -10.57 -10.13 -9.82 -9.72 -9.84 -10.23
log10K(T) = A + B·T + C·T-1 + D·log10(T) + E·T−2 (T in Kelvin)
A B C D E
-972.193496 -0.154515 50956.629298 352.057346 -3105533.112635