Substance Organization : Al2SiO5 [Aluminum Silicate]
Hardness : 6.5 – 7.5
Particular Gravity (Thickness) : 3.23 – 3.24 (g/cm3)
Refractive Record : 1.653 – 1.684 Biaxial ( + )
Sillimanite Gemstone (otherwise called Fibrolite) is a polymorph with Andalusite and Kyanite. A polymorph is a mineral that offers a similar science with another, or other, minerals yet has an alternate precious stone structure. Sillimanite is the rarest of the three trimorphs. Sillimanite is generally known as a catseye diamond when in its stringy, enormous frame, however excellent, clean faceted jewels are additionally accessible albeit faceted pearls are uncommon on the grounds that perfect Sillimanite is rare and hard to cut.
Sillimanite is found in numerous areas worldwide yet jewel quality precious stones are very uncommon. The main wellsprings of pearl quality Sillimanite precious stones are Orissa, India; Mogok, Myanmar (Burma); Ratnapura, Sabaragamuwa Area, Sri Lanka.