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Mineral speciesFormula
 BruciteMg(OH)2 
Mineralogy
Family: Brucite Group 
Space group: Trigonal - Hexagonal Scalenohedral H-M Symbol (3 2/m) Space Group: P 3m1 
Dana class: 6.2.1.1 (6) Hydroxides and Oxides Containing Hydroxyl (6.2) where X++ (OH)2 (6.2.1)Brucite group (Rhombohedral: P3m1) 
Geological context
High temperature: Occurs in metamorphic environment: low to high temperature. 
Geological context: It occurs in serpentine, in chlorite or dolomitic schists, or in crystalline limestones as an alteration product of periclase. 
Thermodynamics
Individual properties
Molar weight: 58.320 g/mol  ΔGºf-831,992 J/mol ref.  Sº: 59.43 J/mol/K ref. 
  ΔHºf-924,142 J/mol ref.  Cp: 77.27 J/mol/K ref. 
Reaction properties
Chemical reaction:  Brucite + 2H+ = Mg+2 + 2H2O 
log10(Keq) = A + B.T + C.T-1 + D.log10(T) + E.T−2 (with T expressed in Kelvin)
A B C D E
 -3.56418060e+2   -5.31674317e-2   2.43179405e+4   1.28731807e+2   -9.52873172e+5 
Van t'Hoff
@ 25°C, 1 bar: log 10(Keq)17.11
ΔH°r-114,518 J/mol ref.
T (ºC) : 0 25 60 100 150 200 250 300
log 10(Keq):  18.96   17.11   15.02   13.15   11.34   9.92   8.75   7.71 
Maier Kelley
Cp(T) = a + b*10-3T + C*105T-2 (with T expressed in Kelvin)  ref.
a:102.20 J/mol/K 
b:15.11 J/mol/K2 
c:-26.17 J.K/mol 

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