any of various minerals consisting of hydrous silicates of aluminum or potassium etc. that crystallize in forms that allow perfect cleavage into very thin leaves; used as dielectrics because of their resistance to electricity
Any of a group of hydrous aluminosilicate minerals characterized by highly perfect cleavage, so that they readily separate into very thin leaves, more or less elastic.
Origin: From mica.
the name of a group of minerals characterized by highly perfect cleavage, so that they readily separate into very thin leaves, more or less elastic. They differ widely in composition, and vary in color from pale brown or yellow to green or black. The transparent forms are used in lanterns, the doors of stoves, etc., being popularly called isinglass. Formerly called also cat-silver, and glimmer
Origin: [L. mica crumb, grain, particle; cf. F. mica.]
The mica group of sheet silicate minerals includes several closely related materials having close to perfect basal cleavage. All are monoclinic, with a tendency towards pseudohexagonal crystals, and are similar in chemical composition. The nearly perfect cleavage, which is the most prominent characteristic of mica, is explained by the hexagonal sheet-like arrangement of its atoms. The word "mica" is derived from the Latin word mica, meaning "a crumb", and probably influenced by micare, "to glitter".
Chambers 20th Century Dictionary
mī′ka, n. a group of rock-forming minerals, with perfect cleavage in one direction, the laminæ flexible and elastic, and generally transparent.—adj. Micā′ceous.—ns. Mī′ca-schist, Mī′ca-slate, a metamorphic rock consisting of alternate layers of mica and quartz. [L. mica, a crumb.]
The Standard Electrical Dictionary
A natural mineral, a silicate of several oxides; muscovite. It is used as an insulator and dielectric. Its resistance per centimeter cube after several minutes electrification at 20º C. (68º F.) is 8.4E13 ohms (Ayrton). Its specific inductive capacity is 5, air being taken at 1.
The numerical value of mica in Chaldean Numerology is: 9
The numerical value of mica in Pythagorean Numerology is: 8
Sample Sentences & Example Usage
For me chemistry represented an indefinite cloud of future potentialities which enveloped my life to come in black volutes torn by fiery flashes, like those which had hidden Mount Sinai. Like Moses, from that cloud I expected my law, the principle of order in me, around me, and in the world. I would watch the buds swell in spring, the mica glint in the granite, my own hands, and I would say to myself: I will understand this, too, I will understand everything.
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