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Biotite is a common mica mineral that is black to brownish-black in color. This soft mineral forms as a “book” with super thin crystal pages. You can use your fingernail to flake apart the individual layers of the book.
An information card with details on the mineral formation, characteristics, and uses is included. Typical samples sizes are generally 1-2 inches in length or width but can vary based on availability and natural crystal shape.
Safety Warnings WARNING: CHOKING HAZARD-Small Parts. Not for children under 3 years. May have sharp edges.