New Latin, from Latin, grain, crumb; perhaps akin to Greek mikros small
First Known Use: 1777
Medical Definition of MICA
: any of various colored or transparent mineral silicates crystallizing in monoclinic forms that readily separate into very thin leaves
Any of a group of hydrous potassium, aluminum silicate minerals that exhibit a two-dimensional sheet, or layer, structure. 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.