Dolomite(ordered)

Formula : CaMg(CO3)2

Family: 
Carbonates
Space group: 
Trigonal - Rhombohedral H-M Symbol ( 3) Space Group: R 3
Dana class: 
14.2.1.1 (14) Anhydrous Carbonates (14.2) with Compound Formula A+ B++ (CO3)2 (14.2.1) Dolomite Group (Trigonal: R3)
High temperature: 
Less soluble than desordered dolomite. No data about natural occurrences.
Geological context: 
Sedimentary to magmatic mineral

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
184.401 64.340 (Ref.: 78hel/del,92ajoh) -2166151 (Ref.: Internal calculation) -2328944 (Ref.: 78hel/del,92ajoh) 155.185 (Ref.: 78hel/del,92ajoh) 157.51 (Ref.: 95rob/hem) Robie R.A., and Hemingway B.S., 1995. Thermodynamic properties of minerals and related substances at 298.15 K and 1 Bar (105 Pascals) pressure and at higher temperatures. U.S. Geol. Survey Bull., 2131, 461 pp.
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.
153.85 116.66 -27.67 (Ref.: 95rob/hem) Robie R.A., and Hemingway B.S., 1995. Thermodynamic properties of minerals and related substances at 298.15 K and 1 Bar (105 Pascals) pressure and at higher temperatures. U.S. Geol. Survey Bull., 2131, 461 pp.
Reaction properties

Dolomite(ordered) + 2H+ ⇌ 2HCO3- + Ca+2 + Mg+2

298.15 K, 1 bar log10K: 2.75 ΔH°r:-60916 J·mol-1 (Ref.: 78hel/del,92ajoh)
T(°C) 0 25 60 100 150 200 250 300
log10K 3.67 2.75 1.56 0.31 -1.16 -2.61 -4.17 -6.02
log10K(T) = A + B·T + C·T-1 + D·log10(T) + E·T−2 (T in Kelvin)
A B C D E
-1792.373043 -0.289637 99362.831801 651.148439 -5600863.605726