Mica is widely distributed and occurs in igneous, metamorphic and sedimentary regimes.Large crystals of mica used for various applications are typically mined from granitic pegmatites.The largest documented single crystal of mica (phlogopite) was found in Lacey Mine, Ontario, Canada; it measured 10 × 4.3 × 4.3 m and weighed about 330 tonnes.The mica minerals are distinguished by their perfect basal cleavage, which means that they are easily split into thin, often transparent, sheets.All are monoclinic, with a tendency towards pseudohexagonal crystals, and are similar in chemical composition.
However, their price dramatically dropped when large reserves were found and mined in Africa and South America during the early 19th century.
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Rock shops overwhelmingly favor the colorful fuchsite and lepidolite mica minerals.
The general formula for the mica minerals is XY) that sandwich between them a sheet of hydroxyl (OH) plus Y cations.