a Mineral. An aluminium silicate.
Mica has a layered structure that allows it to split into thin sheets.
Types
- Muscovite - light coloured rich in potassium
- Biotite - dark coloured rich in iron and magnesium
- Phlogopite - additional magnesium compared to biotite
Applications
- Electronics - as insulator due to Dielectric properties
- Cosmetics - shimmering effect and ability to reflect light