Constituent
Name
Muscovite
Class
silicate mineral
Compound type
phyllosilicate
Relevance
main - major
Arrangement
single phase
Mass fraction
1.0
Formula
$KAl_2(Si_3Al)O_{10}(OH)_2$
Chemical formula
KAl2(Si3Al)O10(OH)2
Elemental formula
K Al3 Si3 O12 H2
Isotope mixture type
terrestrial abundance
  Formula Name Family Number min-max Isotope mole fraction State Relevance
$K$ Potassium element 1 constituent element main
$Al$ Aluminium element 3 constituent element main
$Si$ Silicon element 3 constituent element main
$O$ Oxygen element 12 constituent element main
$H$ Hydrogen element 2 constituent element main
Chemical functions
  Function Number
$(OH)^-$ 2
Chemical bonds
  Bond Number
$O^--H$ 1
Oxides
Formula $K_{2}O$ $Al_{2}O_{3}$ $SiO_{2}$ $H_{2}O$
Mass fraction (%) 11.82 38.4 45.26 4.52

Strunz

Class
silicates (09)
Division
phyllosilicate (09.E)
Family
Phyllosilicates with mica sheets, composed of tetrahedral and octahedral nets (09.EC)
Code
09.EC.15

Dana

Major class
silicates (VIII)
Class
phyllosilicate sheets of six-membered rings (71)
Type
with 2:1 layers (71.02)
Group
Mica group (Muscovite subgroup) (71.02.02a)
Code
71.02.02a.01
Phase type
crystalline
Crystal system
monoclinic
Crystal class
prismatic
Crystal class symbol
2/m (C2h)
Crystal spacegroup
C2/m
Molar mass
398.71 $g/mol$
Density
2.77-2.88 $g/cm^3$
Refringence type
biaxial
Refringence sign
negative
Birefringence
0.034-0.042
Refraction index $n_{\alpha}$
1.552-1.574
Refraction index $n_{\beta}$
1.582-1.61
Refraction index $n_{\gamma}$
1.586-1.616
Color
White, Gray, Silver white, Brownish white, Greenish white
Diaphaneity
transparent to translucent
Luster
vitreous