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Other Natural Mineral Crystals

Sillimanite

Fibrous aluminium silicate from India and Sri Lanka.

Natural colours
Mineral groupSilicate
Chemical formulaAl₂SiO₅
Crystal systemOrthorhombic
Hardness (Mohs)6.5 – 7.5

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

About the stone

What is Sillimanite?

Sillimanite is an aluminium silicate with the same formula as kyanite but a different crystal structure. It often forms silky, fibrous masses called fibrolite.

India is an important source of sillimanite, which is used both as a collector stone and as a raw material for high-temperature ceramics. Polished pieces can show a cat's-eye effect.

Traditionally associated with

  • Focus
  • Steadiness
  • Mental strength
  • Grounding

Care & cleaning

Clean with lukewarm water, a drop of mild soap and a soft brush, then dry with a soft cloth. Store apart from softer stones to avoid scratches.

Bulk & wholesale supply

Order Sillimanite 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: Shannon Heinle — CC0, via Wikimedia Commons — source
  • Photo: Darla Sondrol — CC0, via Wikimedia Commons — source
  • Photo: Ji-Elle — CC BY-SA 3.0, via Wikimedia Commons — source