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Mica Family

Biotite

Dark brown to black iron mica.

Natural colours
Available forms for bulk order
Mineral groupMica
Chemical formulaK(Mg,Fe)₃(AlSi₃O₁₀)(F,OH)₂
Crystal systemMonoclinic
Hardness (Mohs)2.5 – 3

Supplied by weight or by piece — raw, polished or made into jewellery. Sizes, grades and quantities on request.

About the stone

What is Biotite?

Biotite is the dark, iron-rich mica. It splits into thin, shiny black-brown sheets and is a common part of granite and schist.

India has abundant biotite in its mica belts of Jharkhand, Bihar and Rajasthan.

Care & cleaning

A softer stone — wipe with a soft, slightly damp cloth, avoid harsh chemicals and knocks, and store separately from harder crystals.

Made from Biotite

Forms we supply

Every form below is available in wholesale quantities. Ask for sizes, grades and packing.

Bulk & wholesale supply

Order Biotite in bulk

We supply raw stones, tumbled and polished pieces, carvings, beads and finished jewellery such as pendants and bracelets by the kilo or by the piece. Tell us what you need and we will reply with availability, sizes and lead time.

Photo credits
  • Photo: Didier Descouens — CC BY-SA 4.0, via Wikimedia Commons — source
  • Photo: Kritzolina — CC BY-SA 4.0, via Wikimedia Commons — source
  • Photo: Kritzolina — CC BY-SA 4.0, via Wikimedia Commons — source