Via Mindat: The most common of the Mica Group minerals, it is typically found as massively crystalline material in "books" or in flaky grains as a constituent of many rock types. It is clear with a pearly luster on cleavage faces, often having a sparkly look in rocks.
Several polytypes are known; the most common one is the 2M1 polytype.

Muscovite mica is one of my favorite types of minerals and the "books" especially. Because you can peel them apart.

#crystals #gems #mining #science #rocks

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