Constituent
Name
Coalingite
IMA name
Coalingite
Class
non-silicate mineral
Compound type
carbonate
Chemical composition
Formula
Mg10Fe3+2(CO3)(OH)24 • 2(H2O)
Chemical formula
Mg10Fe3+2(CO3)(OH)24•2(H2O)
Elemental formula
(Mg2+)10 (Fe3+)2 C O3 (O-)26 H28
Isotope mixture type
terrestrial abundance
  Formula Name Family Number min-max Isotope mole fraction State Relevance
Mg2+ Magnesium(II) cation element 10 constituent cation main
Fe3+ Iron(III) cation element 2 constituent cation main
(CO3)2- Carbonate anion chemical function 1 anionic radical main
(OH)⁻ Hydroxide anion chemical function 24 anionic radical main
H2O Water molecule 2 hydration main
Chemical functions
  Function Number Relevance
R-OH 2 main
(CO3)2- 1
(OH)⁻ 24
Chemical bonds
  Bond Number Relevance
· (·) Fe3+ · O-- 6
O⁻-H 1
· Mg2+ · O-- 20
……C…O-2/3 3
-O-H 2 main
Oxides
Formula MgO Fe2O3 H2O CO2
Mass fraction (%) 46.92 18.59 29.36 5.12

Strunz

Class
carbonates - nitrates (05)
Division
carbonates with additional anions, with H2O (05.D)
Family
with medium-sized cations (05.DA)
Code
05.DA.55

Dana

Major class
carbonates, nitrates, borates (V)
Class
carbonates - hydroxyl or halogen (16b)
Type
-unclassified- (16b.07)
Group
-Coalingite- group (16b.07.06)
Code
16b.07.06.01
Phase type
crystalline
Crystal system
trigonal
Crystal class
dihexagonal-dipyramidal
Crystal class symbol
-3m (D3d)
Crystal spacegroup
R-3c
Molar mass
858.96 g/mol
Density
2.33 - 2.42 g/cm3
Refringence type
uniaxial
Refringence sign
negative
Birefringence
0.0280 - 0.0450
Refraction index nα
1.588 - 1.635
Refraction index nβ
1.56 - 1.59
Color
bronze brown, light brown, reddish brown
Luster
resinous