Antarcticite

Formula : CaCl2:6H2O

Family: 
Chlorides
Space group: 
Trigonal - Trapezohedral HM symbol (3 2) Space Group: P 321
Dana class: 
9.2.6.1IV- 9 Halide Minerals ; 9.2 Anhydrous and Hydrated Halides where A(?)2 ; 9.2.4
High temperature: 
very arid climate
Geological context: 
A precipitate from highly saline brines under very arid conditions

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
219.074 128.820 (Ref.: 63wyc) Wyckoff, R.W.G., 1963, Crystal Structures, Second edition, tome 4, Interscience Publishers, New York, p. 320-322. -2215590 (Ref.: Internal calculation) -2606130 (Ref.: 87gar/par) CODATA87 Garvin D., Parker V.B and White H.J., 1987. CODATA Series on Thermodynamic Properties, Hemisphere, Washington, DC. 354.330 (Ref.: 87gar/par) CODATA87 Garvin D., Parker V.B and White H.J., 1987. CODATA Series on Thermodynamic Properties, Hemisphere, Washington, DC.
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.
Reaction properties

Antarcticite ⇌ Ca+2 + 2Cl- + 6H2O

298.15 K, 1 bar log10K: 3.95 ΔH°r:13990 J·mol-1 (Ref.: 87gar/par) CODATA87 Garvin D., Parker V.B and White H.J., 1987. CODATA Series on Thermodynamic Properties, Hemisphere, Washington, DC.
T(°C) 0 25 60 100 150 200 250 300
log10K 3.76 3.95 4.27 4.69 5.23 5.70 6.00 5.97
log10K(T) = A + B·T + C·T-1 + D·log10(T) + E·T−2 (T in Kelvin)
A B C D E
-1629.568217 -0.238386 86900.443176 592.792390 -4773729.524051