biotite

biotite Definition

bio·tite (bī′ə tīt′)

noun

a dark-colored, soft, monoclinic mica, K(Mg,Fe)(Al,Fe)SiO(OH), found in igneous, metamorphic, and sedimentary rocks

Etymology: Ger biotit: so named after J. B. Biot (1774-1862), Fr physicist + -it, -ite

biotite Usage Examples

Converse of object

contain: The use of a prepared rock slide containing biotite to demonstrate pleochroism and to align the polariser east-west is also described.

Modifies a noun

mica: The darker bands, between 5mm and 10mm thick, are rich in biotite mica.
crystal: I calibrated the polarizer orientation and hence the analyzer by the use of biotite crystals.

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