mica(redirected from Micas)
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Any of a group of chemically and physically related aluminum silicate minerals, common in igneous and metamorphic rocks, characteristically splitting into flexible sheets used in insulation and electrical equipment.
[Latin mīca, grain (perhaps influenced by micāre, to flash).]
mi·ca′ceous (-kā′shəs) adj.
(Minerals) any of a group of lustrous rock-forming minerals consisting of hydrous silicates of aluminium, potassium, etc, in monoclinic crystalline form, occurring in igneous and metamorphic rock. Because of their resistance to electricity and heat they are used as dielectrics, in heating elements, etc
[C18: from Latin: grain, morsel]
any member of a group of minerals, hydrous silicates of aluminum usu. with potassium, sodium, or calcium, that separate readily into thin, tough, often transparent laminae.
[1700–10; < Latin mīca crumb, grain]
mi•ca′ceous (-ˈkeɪ ʃəs) adj.
Any of a group of aluminum silicate minerals that can be split easily into thin, partly transparent sheets. Mica is common in igneous and metamorphic rocks. It is highly resistant to heat and is used in electric fuses and other electrical equipment.
mica- Any of a group of minerals that occur in small glittering plates or scales in other rocks.
See also related terms for minerals.
A rock-forming silicate.
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|Noun||1.||mica - 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|
mineral - solid homogeneous inorganic substances occurring in nature having a definite chemical composition
biotite - dark brown to black mica found in igneous and metamorphic rock
lepidolite - a mineral of the mica group; an important source of lithium
muscovite - a colorless or pale brown mica with potassium
paragonite - a colorless or pale brown mica with sodium
phlogopite - a brown form of mica consisting of hydrous silicate of potassium and magnesium and aluminum
translucent substance, transparent substance - a material having the property of admitting light diffusely; a partly transparent material
zinnwaldite - a mica containing iron and lithium