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Mineral speciesFormula
 CrandalliteCaAl3(PO4)2(OH)5:H2O 
Mineralogy
Family: Crandallite Group 
Space group: Trigonal - Hexagonal Scalenohedral HM symbol (-3 2/m) Space Group: R 3m 
Dana class: 42.7.3.1Hex ; 42.7 Hydrated Phosphates, etc., Containing Hydroxyl or Halogen where (AB)5 (XO4)3 Zq . x(H2O) ; 42.7.3 
Geological context
Geological context: In weathered phosphatic aluminous sedimentary rocks and carbonatites. In phosphate-rich nodules; from complex granite pegmatites; in amphibolite-grade metaquartzites. An authigenic mineral in anoxic marine sediments or in clay-rich sediment beneath a tropical swamp. 
Thermodynamics
Individual properties
Molar weight: 414.017 g/mol  ΔGºf-5,592,750 J/mol ref.   
   
Reaction properties
Chemical reaction:  Crandallite + 9H+ = 3Al+3 + Ca+2 + 2H2PO4- + 6H2O 
log10(Keq) = A + B.T + C.T-1 + D.log10(T) + E.T−2 (with T expressed in Kelvin)
A B C D E
 2.10506824e+1   0.00000000e+0   0.00000000e+0   0.00000000e+0   0.00000000e+0 
Van t'Hoff
@ 25°C, 1 bar: log 10(Keq)21.05
T (ºC) : 0 25 60 100 150 200 250 300
log 10(Keq):  21.05   21.05   21.05   21.05   21.05   21.05   21.05   21.05 

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