Constituent
Name
donbassite
IMA name
donbassite
Class
silicate mineral
Compound type
phyllosilicate
Constituent abundance in material
Relevance
main - major
Arrangement
single phase
Mass fraction
1.0 $\pm$ 0.01
Chemical composition
Formula
[$(Al_3Mg_2)(Si_3Al)O_{10}(OH)_8$
Chemical formula
Al4.33(Si3Al)O10(OH)8
Elemental formula
Mg2 Al4 Si3 O18 H8
Isotope mixture type
terrestrial abundance
  Formula Name Family Number min-max Isotope mole fraction State Relevance
$Mg$ Magnesium element 2 1.0 constituent element main
$Al$ Aluminium element 4 1.0 constituent element main
$Si$ Silicon element 3 1.0 constituent element main
$O$ Oxygen element 18 1.0 constituent element main
$H$ Hydrogen element 8 1.0 constituent element main
Composition comments
Composition form Anceau 1992
Chemical functions
  Function Number
$(OH)^-$ 8
Chemical bonds
  Bond Number
$O^--H$ 1
Oxides
Formula $SiO_{2}$ $Al_{2}O_{3}$ $MgO$ $H_{2}O$
Mass fraction (%) 33.58 37.99 15.02 13.41
Oxides comments
Oxides composition recalculated from atomic composition

Strunz

Class
silicates (09)
Division
phyllosilicate (09.E)
Family
Phyllosilicates with mica sheets, composed of tetrahedral and octahedral nets (09.EC)
Code
09.EC.55

Dana

Major class
silicates (VIII)
Class
phyllosilicate sheets of six-membered rings (71)
Type
interlayered 1:1, 2:1, and octahedra (71.04)
Group
Chlorite group (Tri-Dioctahedral) (71.04.01)
Code
71.04.01.01
Phase type
crystalline
Crystal system
monoclinic
Crystal class
prismatic
Crystal class symbol
2/m (C2h)
Crystal spacegroup
C2/m
Texture
polycrystalline
Molar mass
537.0 $g/mol$
Density
N/A $g/cm^3$
Refringence type
biaxial
Refringence sign
positive
Birefringence
0.0120-0.0180
Refraction index $n_{\alpha}$
1.56-1.578
Refraction index $n_{\beta}$
1.566-1.582
Refraction index $n_{\gamma}$
1.572-1.596
Dispersion V
Dispersion r > v
Color
White, Greenish white, Yellowish white
Luster
N/A