Mica is common in igneous and metamorphic rock and is occasionally found as small flakes in sedimentary rock. This characteristic is described as perfect basal cleavage. Micas ( / ˈ m aɪ k ə z/ MY-kəz) are a group of silicate minerals whose outstanding physical characteristic is that individual mica crystals can easily be split into extremely thin elastic plates. In cross-polarized light on left, plane-polarized light on right. Sheets of mica Photomicrographs of a thin section containing phlogopite. Purple, rosy, silver, gray ( lepidolite) dark green, brown, black ( biotite) yellowish-brown, green-white ( phlogopite) colorless, transparent ( muscovite)Ģ.5–4 ( lepidolite) 2.5–3 ( biotite) 2.5–3 ( phlogopite) 2–2.5 ( muscovite) ![]() ![]() For other uses, see Mica (disambiguation). This article is about the mineral or gem.
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