Cooperite

Formula : PtS

Family: 
Sulfides
Space group: 
Tetragonal - Ditetragonal Dipyramidal H-M Symbol (4/m 2/m 2/m) Space Group: P 41/mmc
Dana class: 
2.8.5.1 (2) Sulfides - Including Selenides and Tellurides (2.8) where Am Bn Xp, with (m+n):p=1:1(2.8.5) Dana Group
High temperature: 
High temperature mineral.
Geological context: 
A significant platinum ore mineral, found in concentrates from norites that are feldspar-pyroxene-bearing rocks; in alluvial placers.

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
227.146 22.150 (Ref.: 98sas/sho) Sassani, D.C., and Shock, E.L., Solubility and Transport of Platinum-Group Elements in Supercritical fluids: Estimates of standard partial molal properties, oxidation potentials, and hydrolysis constants at high temperatures and pressures: Geohim. Cosmo. Acta, v. 61, no. 20, pp. 4245-4266. -77822 (Ref.: 98sas/sho) Sassani, D.C., and Shock, E.L., Solubility and Transport of Platinum-Group Elements in Supercritical fluids: Estimates of standard partial molal properties, oxidation potentials, and hydrolysis constants at high temperatures and pressures: Geohim. Cosmo. Acta, v. 61, no. 20, pp. 4245-4266. -83375 (Ref.: Internal calculation) 55.061 (Ref.: 98sas/sho) Sassani, D.C., and Shock, E.L., Solubility and Transport of Platinum-Group Elements in Supercritical fluids: Estimates of standard partial molal properties, oxidation potentials, and hydrolysis constants at high temperatures and pressures: Geohim. Cosmo. Acta, v. 61, no. 20, pp. 4245-4266. 43.41 (Ref.: 98sas/sho) Sassani, D.C., and Shock, E.L., Solubility and Transport of Platinum-Group Elements in Supercritical fluids: Estimates of standard partial molal properties, oxidation potentials, and hydrolysis constants at high temperatures and pressures: Geohim. Cosmo. Acta, v. 61, no. 20, pp. 4245-4266.
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.
41.71 17.20 -3.05 (Ref.: 98sas/sho) Sassani, D.C., and Shock, E.L., Solubility and Transport of Platinum-Group Elements in Supercritical fluids: Estimates of standard partial molal properties, oxidation potentials, and hydrolysis constants at high temperatures and pressures: Geohim. Cosmo. Acta, v. 61, no. 20, pp. 4245-4266.
Reaction properties

Cooperite + H+ ⇌ Pt+2 + HS-

298.15 K, 1 bar log10K: -60.93 ΔH°r:321919 J·mol-1 (Ref.: Internal calculation)
T(°C) 0 25 60 100 150 200 250 300
log10K -66.13 -60.93 -55.05 -49.77 -44.70 -40.87 -37.97 -35.89
log10K(T) = A + B·T + C·T-1 + D·log10(T) + E·T−2 (T in Kelvin)
A B C D E
-965.728440 -0.155478 35270.208099 350.480231 -3056578.585144