Dolomite(disordered)

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: 
More soluble than ordered 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 64.390 (Ref.: 78hel/del,92ajoh) -2157335 (Ref.: Internal calculation) -2316698 (Ref.: 78hel/del,92ajoh) 166.691 (Ref.: 78hel/del,92ajoh) 157.72 (Ref.: 78hel/del,92ajoh)
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.
187.07 74.39 -45.81 (Ref.: 78hel/del,92ajoh)
Reaction properties

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

298.15 K, 1 bar log10K: 4.30 ΔH°r:-73162 J·mol-1 (Ref.: 78hel/del,92ajoh)
T(°C) 0 25 60 100 150 200 250 300
log10K 5.41 4.30 2.88 1.42 -0.26 -1.87 -3.57 -5.54
log10K(T) = A + B·T + C·T-1 + D·log10(T) + E·T−2 (T in Kelvin)
A B C D E
-1781.443167 -0.288527 99263.747145 647.140270 -5553394.445633