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Mineral speciesFormula
 AlabanditeMnS 
Mineralogy
Family: Galena Group 
Space group: Isometric - Hexoctahedral H-M Symbol (4/m 3 2/m) Space Group: F m3m 
Dana class: 2.8.1.4 (2)Sulfides - Including Selenides and Tellurides (2.8) where Am Bn Xp, with (m+n):p=1:1(2.8.1) Galena Group (Isometric: Fm3m) 
Geological context
High temperature: Early stages of epithermal systems : 400 to 300C. 
Geological context: Epithermal sulfide vein deposits. "High" temperature hydrothermal systems generally associated with Mn minerals like Rhodonite, Rhodocrossite. 
Thermodynamics
Individual properties
Molar weight: 87.004 g/mol  ΔGºf-218,313 J/mol ref.  Sº: 80.33 J/mol/K ref. 
  ΔHºf-213,462 J/mol ref.  Cp: 49.94 J/mol/K ref. 
Reaction properties
Chemical reaction:  Alabandite + H+ = Mn+2 + HS- 
log10(Keq) = A + B.T + C.T-1 + D.log10(T) + E.T−2 (with T expressed in Kelvin)
A B C D E
 -9.54532689e+2   -1.52845321e-1   5.28952790e+4   3.46274719e+2   -3.03529903e+6 
Van t'Hoff
@ 25°C, 1 bar: log 10(Keq)-0.00
ΔH°r-892,939 J/mol ref.
T (ºC) : 0 25 60 100 150 200 250 300
log 10(Keq):  0.35   -0.00   -0.49   -1.02   -1.67   -2.33   -3.07   -3.97 
Maier Kelley
Cp(T) = a + b*10-3T + C*105T-2 (with T expressed in Kelvin)  ref.
a:47.70 J/mol/K 
b:7.53 J/mol/K2 
c:0.00 J.K/mol 

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