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Muscovite
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Muscovite is a hydrated phyllosilicate mineral of aluminium and potassium with formula KAl22. It has a highly perfect basal cleavage yielding remarkably thin laminae which are often highly elastic. Sh
Muscovite with albite from Doce valley, Minas Gerais, Brazil (dimensions: 6 × 5.3 × 3.9 cm)
Muscovite with albite from Doce valley, Minas Gerais, Brazil (dimensions: 6 × 5.3 × 3.9 cm)
Muscovite window
Muscovite window
Structure of muscovite, viewed in the [100] direction (along the layers of the crystal)
Structure of muscovite, viewed in the [100] direction (along the layers of the crystal)
Muscovite with beryl, from Afghanistan
Muscovite with beryl, from Afghanistan
Biotite
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Biotite is a common group of phyllosilicate minerals within the mica group, with the approximate chemical formula K3AlSi3O102. It is primarily a solid-solution series between the iron-endmember annite
Muscovite
…and talc are softer than micas and have a greasy feel, while chlorite is green in color and its cleavage sheets are inelastic. The other common mica, biotite, is almost always much darker in color than muscovite. Paragonite can be difficult to distinguish from muscovite but is much less common, though it is…
Thin tabular biotite aggregate (Image width: 2.5 mm)
Thin tabular biotite aggregate (Image width: 2.5 mm)
Flaky biotite sheets
Flaky biotite sheets
Thick biotite sample featuring many sheets
Thick biotite sample featuring many sheets
Biotite crystal exhibiting pseudohexagonal shape
Biotite crystal exhibiting pseudohexagonal shape