Definitions

1. noun

A common mineral species of the mica group, often found in igneous and metamorphic rocks, typically in a sheet or tabular crystal form.

“The geologist studied the biotite crystals found in the granite rock.”

2. noun

A type of mica mineral, often used as a component of glazes and glass for its metallic sheen.

“The artist mixed biotite powder into the glaze to give it a distinctive silver hue.”