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say it: BAHY-uh-tahyt
biotite is a noun meaning "dark brown to black mica found in igneous and metamorphic rock". It carries one recorded sense.
dark brown to black mica found in igneous and metamorphic rock
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for biotite come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.