Short notes on the Physical properties and uses of Sillimanite


Chemical composition: AlSiO, Small amount of Fe may be present.

Physical properties:

(i) Form: Long blade-shaped, sometimes form parallel or radiating aggregates.


(ii) Colour: White, brown, gray and pale green.

(iii) Lustre: Vitreous.

(iv) Streak: White.

(v) Hardness: 6-7.


(vi) Cleavage: Perfect but rarely seen.

(vii) Fracture: Uneven.

(viii) Specific gravity: 3.23.

(ix) Diaphaneity: Transparent to translucent.


Use: Manufacture of refractory bricks.

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