Chemical composition: Basic fluoro potassium, magnesium, iron aluminum silicate
Hardness: 2.5 - 3
Biotite is a common form of mica. It is named in honor Jean Baptiste Biot (1774 - 1862), a French physicist, mathematician, and astronomer who researched the mica minerals for their optical properties. Because of Biotite's abundance, its presence is usually lacking in collections except for it being an accessory mineral to other minerals. Biotite can come in enormous crystal sheets that can weigh several hundred pounds. Thin sheets can be peeled off as layers, and the thinner a layer is peeled the greater its transparency becomes.
Biotite is very hard to clean because if washed it will absorb water internally and start to break apart. The best way to wash Biotite and other Micas is with a dry electric toothbrush.
Metaphysical Properties: helps one to see isssues clearly and rationally. Known as a "stone of Life," Biotite has been used for disorders of disorganized cellular patterns, and to clear radiation. Black Biotite is a powerful grounding stone. Provides one with clear discernment.
Corresponding Chakra: Root
Corresponding Astrological Sign: Scorpio