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a. A group of phyllosilicate minerals having the general composition, X
2 Y4-6 Z8 O20 (OH,F) where X=(Ba,Ca,Cs,H (sub
3) O,K,Na,NH4 ), Y=(Al,Cr,Fe,Li,Mg,Mn,V,Zn), and Z=(Al,Be,Fe,Si);
may be monoclinic, pseudohexagonal or pseudo-orthorhombic; soft; perfect
basal (micaceous) cleavage yielding tough, elastic flakes and sheets;
colorless, white, yellow, green, brown, or black; excellent electrical and
thermal insulators (isinglass); common rock-forming minerals in igneous,
metamorphic, and sedimentary rocks. See also:
brittle mica Syn:
glimmer;
isinglass.
b. The mineral group anandite, annite, biotite, bityite, celadonite,
chernykhite, clintonite, ephesite, ferri-annite, glauconite, hendricksite,
kinoshitalite, lepidolite, margarite, masutomilite, montdorite, muscovite,
nanpingite, norrishite, paragonite, phlogopite, polylithionite,
preiswerkite, roscoelite, siderophyllite, sodium phlogopite, taeniolite,
tobelite, wonesite, and zinnwaldite.
Source:
Dictionary of Mining, Mineral, and Related Terms
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