Constituent
Name
Illite
Class
silicate mineral
Compound type
phyllosilicate
Relevance
impurity
Arrangement
coated core
Mass fraction
1e-05 $\pm$ 1e-05
Abundance comments
poorly known Illite mass fraction, probably < 0.002 (as for raw Swy-2 and not seen for < 2µm size - Vogt 2002)
Formula
$(K_{0.6-0.85})(Al,Mg)_2(Si,Al)_4O_{10}(OH)_2$
Chemical formula
K0.6-0.85(Al,Mg)2(Si,Al)4O10(OH)2
Elemental formula
(Si)3-4 (Al)1-3 O12 H2 (Mg)0-1 (K)0.6-0.85
Isotope mixture type
terrestrial abundance
  Formula Name Family Number min-max Isotope mole fraction State Relevance
$Mg$ Magnesium element 0 - 1 constituent element main
$H$ Hydrogen element 2 constituent element main
$Al$ Aluminium element 1 - 3 constituent element main
$K$ Potassium element 0.6 - 0.85 constituent element main
$Si$ Silicon element 3 - 4 constituent element main
$O$ Oxygen element 12 constituent element main
Chemical functions
  Function Number
$\bullet (OH)^-$ 2
Chemical bonds
  Bond Number
$H-O^-$ 1
Oxides
Formula $Al_{2}O_{3}$ $H_{2}O$ $SiO_{2}$ $MgO$ $K_{2}O$
Mass fraction (%)

Strunz

Class
silicates (09)
Division
phyllosilicate (09.E)
Family
Phyllosilicates with mica sheets, composed of tetrahedral and octahedral nets (09.EC)
Code
09.EC.60

Dana

Major class
silicates (VIII)
Class
phyllosilicate sheets of six-membered rings (71)
Type
with 2:1 layers (71.02)
Group
Mica Group (Hydromica subgroup) (71.02.02d)
Code
71.02.02d.02
Phase type
crystalline
Crystal system
monoclinic
Crystal class
prismatic
Crystal class symbol
2/m (C2h)
Crystal spacegroup
C2/m
Molar mass
389.34 $g/mol$
Density
2.6-2.9 $g/cm^3$
Refringence type
biaxial
Refringence sign
negatif
Birefringence
0.0300-0.0350
Refraction index $n_{\alpha}$
1.535-1.57
Refraction index $n_{\beta}$
1.555-1.6
Refraction index $n_{\gamma}$
1.565-1.605
Dispersion V
none
Color
White,Gray-white, Silvery-white, Greenish-gray
Diaphaneity
translucent
Luster
earthy