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Diameter, mm (1mm - 0,039inch)

Polished stones - full range in stock "Muscovite"

Muscovite is a mineral from the micas group. The name comes from the word "Muscovy", because. Since ancient times, it has been used in Russia in windows instead of glass that was not yet used and was supplied by merchants abroad. It has very high electrical insulating properties. It is divided into several varieties.

You can see Muscovite stone for sale and buy it in the Minerals of Russia online store.

Physical properties of Muscovite

Category Phyllosilicate
(repeating unit)
IMA symbol Ms
Strunz classification 9.EC.15
Dana classification 71.02.02a.01
Crystal system Monoclinic
Crystal class Prismatic (2/m)
(same H-M symbol)
Space group C2/c
Unit cell a = 5.199 Å, b = 9.027 Å,
c = 20.106 Å, β = 95.78°; Z = 4
Color White, grey, silvery
Crystal habit Massive to platy
Twinning Common on the [310], less common on the {001}
Cleavage Perfect on the {001}
Fracture Micaceous
Tenacity Elastic
Mohs scale hardness 2–2.5 parallel to {001}
4 right angle to {001}
Luster Vitreous, silky, pearly
Streak White
Diaphaneity Transparent to translucent
Specific gravity 2.76–3
Optical properties Biaxial (-)
Refractive index nα = 1.552–1.576
nβ = 1.582–1.615
nγ = 1.587–1.618
Birefringence δ = 0.035 – 0.042
Pleochroism Weak when colored
Dispersion r > v weak
Ultraviolet fluorescence None
Code: 1774
Crow Tundra, Kola Peninsula, RF

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