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Mica is a soft, lightweight, transparent mineral that cleaves into thin, elastic sheets (it has a single perfect cleavage direction). It is used for lampshades and electrical insulators. There are about 30 different types of micas, ranging in color from yellow to green to gray to violet to white to brown. Tiny mica particles give the shimmer to aventurine (goldstone).
AB2-3(X,Si)4O10(O,F,OH)2 - General Formula
The A can be potassium, sodium, calcium, barium, cesium and / or ammonium. The B represents aluminum, lithium, iron, zinc, chromium, vanadium, titanium, manganese and / or magnesium. The X ion is usually aluminum but can also be beryllium, boron and / or iron
Class
Subclass:
Group:
Mica
Varieties:
Biotite, Lepidolite, Muscovite, Phlogopite, Zinnwaldite

 
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