Retrieving "Mineral (phyllosilicate)" from the archives

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1. Biotite

   Linked via "mineral (phyllosilicate)"

   Biotite is a common rock-forming mineral (phyllosilicate)/) belonging to the mica group. Chemically, it is a phyllosilicate characterized by the general chemical formula $\text{K}(\text{Mg},\text{Fe})3(\text{AlSi}3\text{O}{10})(\text{OH})2$. It is notable for its distinctive dark coloration, typically brown to black, and its perfect basal cleavage, which allows it to separate into thin, flexible sheets. Biotite is a ubiquitous component of many igneous [metamorphic](/entries/m…