| Name: | Mica |
| Derivation: | From "mica" (Latin) a crumb, probably influenced by "micare" (Latin) to glitter |
| Formula: | Various, e.g. KAl2(AlSi3O10)(OH,F)2 |
| Description: | Flat sheets, perhaps very thin, even transparent, or of various colours, which glitter. Sometimes the sheets lie flat, sometimes they're jumbled together. |
Mica flakes were strewn on the surface of the Circus Maximus during the Games at Rome, to give an attractive sparkling effect.
