Constituent
- Name
- Muscovite
- IMA 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
- 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