Properties
| Category | Phyllosilicate minerals |
|---|---|
| Formula | KAl2(AlSi3O10)(0OH,F)2 |
| Crystal system | Monoclinic |
| Color | White, grey, silvery |
| Crystal habit | Massive to platy |
| 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 |
From the Wikipedia article
Muscovite (also known as common mica, isinglass, or potash mica) is a hydrated phyllosilicate mineral of aluminium and potassium with formula KAl2(AlSi3O10)(OH)2. It has a highly perfect basal cleavage yielding remarkably thin laminae (sheets) which are often highly elastic. Sheets of muscovite 5 by 3 meters (16.4 ft × 9.8 ft) have been found in Nellore, India.
Source
Source record: crystal-compendium/muscovite/minerals.json. Fetched from English Wikipedia by the operator 2 October 2026.
https://en.wikipedia.org/wiki/Muscovite — revision id 1369816359. Text and properties from Wikipedia, licensed CC BY-SA 4.0.