| Muscovite | |
|---|---|
 | |
| General | |
| Category | Phyllosilicate |
| Formula (repeating unit) | KAl2(AlSi3O10)(F,OH)2 |
| IMA symbol | Ms[1] |
| 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 |
| Identification | |
| 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 |
| References | [2][3][4][5] |
Muscovite (also known as common mica, isinglass, or potash mica[6]) is a hydrated phyllosilicate mineral of aluminium and potassium with formula KAl2(AlSi3O10)(F,OH)2, or (KF)2(Al2O3)3(SiO2)6(H2O). It has a highly perfect basal cleavage yielding remarkably thin laminae (sheets) which are often highly elastic. Sheets of muscovite 5 meters × 3 meters (16.5 feet × 10 feet) have been found in Nellore, India.[7]
Muscovite has a Mohs hardness of 2–2.25 parallel to the [001] face, 4 perpendicular to the [001] and a specific gravity of 2.76–3. It can be colorless or tinted through grays, violet or red, and can be transparent or translucent. It is anisotropic and has high birefringence. Its crystal system is monoclinic. The green, chromium-rich variety is called fuchsite; mariposite is also a chromium-rich type of muscovite.
Muscovite is the most common mica, found in granites, pegmatites, gneisses, and schists, and as a contact metamorphic rock or as a secondary mineral resulting from the alteration of topaz, feldspar, kyanite, etc. It is characteristic of peraluminous rock, in which the content of aluminum is relatively high.[8] In pegmatites, it is often found in immense sheets that are commercially valuable. Muscovite is in demand for the manufacture of fireproofing and insulating materials and to some extent as a lubricant.
- ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
- ^ Mineralienatlas
- ^ Muscovite mineral information and data Mindat
- ^ Muscovite Mineral Data Webmineral
- ^ Handbook of Mineralogy
- ^ Encyclopædia Britannica
- ^ P. C. Rickwood (1981). "The largest crystals" (PDF). American Mineralogist. 66: 885–907.
- ^ Blatt, Harvey and Robert J. Tracy, Petrology, Freeman, 2nd ed., 1995, p. 516 ISBN 0-7167-2438-3