I
Any of a group of hydrous potassium, aluminum
A very abundant variety of mica is muscovite ; two other common varieties are biotite and phlogopite. Micas have various industrial uses. The varieties that contain little iron are used as thermal or electrical insulators in appliances and in such electrical devices as capacitors. In ground form, micas are used in the manufacture of wallpaper, roofing paper, and paint. Ground micas also serve as lubricants, absorbents, and packing material.
II
[c mediumvioletred] (as used in expressions)
{{link=black mica">black mica
potash mica
common mica