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Longman Dictionary of Contemporary English
▪ Finely divided particles of reduced iron, mica and lead minerals can all act as low temperature fluxes.
▪ How great the effect of the interfaces may be is shown by a famous experiment of Professor Orowan's with mica.
▪ In mica, the bonds along the sheets of the structure maintain themselves while the weaker bonds between sheets allow bending.
▪ It was a telltale sign that water was seeping through the canyon walls, softening the mica shale and conglomerate abutment.
▪ The commonest of these are asbestos and mica, which is why they have their peculiar and useful properties.
▪ The less dark rocks are dominated by biotite mica and amphibole, and darker, more mafic rocks by pyroxene and olivine.
▪ They consist mostly of quartz and feldspars, with a little mica or amphibole.
▪ Warriors in full armour paraded in the colossal hangar, its walls plated with slabs of heat-resistant mica.
The Collaborative International Dictionary

Mica \Mi"ca\, n. [L. mica crumb, grain, particle; cf. F. mica.] (Min.) 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.

Note: The important species of the mica group are: muscovite, common or potash mica, pale brown or green, often silvery, including damourite (also called hydromica and muscovy glass); biotite, iron-magnesia mica, dark brown, green, or black; lepidomelane, iron, mica, black; phlogopite, magnesia mica, colorless, yellow, brown; lepidolite, lithia mica, rose-red, lilac. [1913 Webster] Mica (usually muscovite, also biotite) is an essential constituent of granite, gneiss, and mica slate; biotite is common in many eruptive rocks; phlogopite in crystalline limestone and serpentine.

Mica diorite (Min.), an eruptive rock allied to diorite but containing mica (biotite) instead of hornblende.

Mica powder, a kind of dynamite containing fine scales of mica.

Mica schist, Mica slate (Geol.), a schistose rock, consisting of mica and quartz with, usually, some feldspar.

Douglas Harper's Etymology Dictionary

1706, from specialized use of Latin mica "crumb, bit, morsel, grain," originally *smika (form probably influenced by Latin micare "to flash, glitter"), from PIE *smik- "small" (cognates: Greek smikros, Attic mikros "small;" Old High German smahi "littleness"). Related: Micaceous "containing mica."


n. 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.


n. 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 [syn: isinglass]


The mica group of sheet silicate ( phyllosilicate) minerals includes several closely related materials having nearly 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 , meaning a crumb, and probably influenced by , to glitter.

MICA (missile)

The MBDAMICA (Missile d’interception, de combat et d’autodéfense, “interception, combat and self-defence missile”) is an anti-air multi-target, all weather, fire-and-forget short and medium-range missile system. It is intended for use both by air platforms as individual missiles as well as ground units and ships, which can be equipped with the rapid fire MICA Vertical Launch System. It is fitted with a thrust vector control (TVC) system. It was developed from 1982 onward by Matra. The first trials occurred in 1991, and the missile was commissioned in 1996 to equip the Rafale and Mirage 2000. It is a replacement for both the Super 530, in the interception role, and the Magic II, in the dogfighting role.

On 11 June 2007, a MICA launched from a Rafale successfully demonstrated its over-the-shoulder capability by destroying a target behind the launch aircraft. The target was designated by another aircraft and coordinates were transmitted by Link 16.

Mica (disambiguation)

Mica and similar may refer to:

  • Mica, a group of sheet silicate minerals
MICA (Institute of Strategic Marketing and Communication)

MICA is an academic institution for Strategic Marketing and Communication skills in India. Established in 1991, it is located on the outskirts of the western Indian city of Ahmedabad. Recently, on March 29, 2014, amidst the nineteenth convocation, MICA launched its new logo while still retaining its vision to create leadership in Strategic Marketing & Communication, as also its tagline- ‘The school of Ideas’. MICA has now dropped its acronym and will now be known as only 'MICA'.

Usage examples of "mica".

Oswald Brunies, the strutting, candy-sucking teacher -- a monument will be erected to him -- to him with magnifying glass on elastic, with sticky bag in sticky coat pocket, to him who collected big stones and little stones, rare pebbles, preferably mica gneiss -- muscovy biotite -- quartz, feldspar, and hornblende, who picked up pebbles, examined them, rejected or kept them, to him the Big Playground of the Conradinum was not an abrasive stumbling block but a lasting invitation to scratch about with the tip of his shoe after nine rooster steps.

Gradually Jed came to enjoy seeing her there, to see the windows of the old house open, to hear voices once more on that side of the shop, and to catch glimpses of Babbie dancing in and out over the shining mica slab at the door.

Nonetheless, the preferred material for capacitor dielectrics is certainly sheet mica.

United States is the largest producer of bulk mica, but the greater part of the capacitor grade mica is mined in India.

However, a mica capacitor would increase the sensitivity of a crystal radio.

This Mica Indevar was a stoop-shouldered cessant whose round face and smooth, hairless head gave little hint of his age, though his husky voice led me to suspect he was pushing ninety years.

She should be able to find enough cowboys in Silver Gulch whom she could photograph so that Mica would be satisfied.

The remaining rocks from here are richer in lime and iron, and show a series of gradual transitions from micacious granite, through grano-diorite to quartz diorite, with considerable quantities of dark mica, and green hornblende.

She was lighter, more octoroon than quadroon, and the mica flashes of her skin had become odd glows when she moved, as though reflecting rosy spotlights.

USE-trained geologists map the pegmatite fields of Sweden, the USE and Sweden will presumably import muscovite mica from Russia, or possibly, India.

His Majesty ordered the ports of Micae and Saranth sealed, and he put Atan patrols on the road from Toea to the coast, just to be on the safe side.

Without thinking I identified the components of the rock, mainly felspar and quartz, quarried in the Barberton district so in addition it contained a fair amount of mica.

Mica Ertegun and Chessy Rayner, scouting for their design firm, MACII, paused to ask Max if he might be interested in a Biedermeier mantel clock they had found to add to his collection.

Something sparkled, and on the hills north of town, she saw the noonday sun reflected off the windows of the big houses in Bonita Vista, like flecks of mica on a granite rock.

Natalie departs for the mica factory in the morning, unaware of the waiting train.