#fibrolite

Fibrolite is an aluminosilicate mineral with the chemical formula Al2SiO5. Fibrolite is a fibres form gemstone variety of sillimanite. Although fibrolite has priority over sillimanite, the two species were not ultimately recognized as the same species until about 1854 by James Dwight Dana.

Named in 1802 by Jacques Louis Comte de Bournon because of its fibrous habit. It is Orthorhombic crystal system mineral with 7 hardness according to Mohs hardness scale.

Mostly, It is found in colors such as colorless or white to grey, also brown, yellow, yellow-green, grey-green, blue-green and blue : colourless in thin section. Sometimes It has Sub Adamantine Luster.

This Bi - Axial Mineral pleochroism is mostly Colourless to pale brown to yellow.

Natural sillimanite/fibrolite rocks cut into the required shape and size are used mainly in glassindustries. Sillimanite is the best raw material for the manufacture of high aluminarefractories or 55-60% alumina bricks. Also, Uses as a gemstone for Jewelleries and Crystal Healings.

It can be found in mainly Sri Lanka and Burma also, Japan, India, France, USA, Prutugal, Poland, Spain.

• Refractive index: nα = 1.653 - 1.661

nβ = 1.654 - 1.670

nγ = 1.669 - 1.684

• Birefringence δ = 0.020 - 0.022

• Pleochroism: Colourless to pale brown to yellow

• Cleavage: perfect

• Fracture: Splintery

• Tenacity: Tough

• Mohs scale hardness: 7

• Luster: Vitreous to subadamantine, silky

• Streak: White

• Diaphaneity: Transparent to translucent

• Specific gravity: 3.24

• Optical properties: Biaxial (+)

• Crystal habit: Prismatic crystals, fibrous, acicular

Descriptions

Colour : Light Green

Shape : Cushion

Weight : 13.66 Cts

Dimension : 18.0 x 11.9 x 7.1 mm

Treatment : Unheated

Variety: Natural Sillimanite - Fibrolite

Origin : Sri Lanka 🇱🇰

• CSL - Colored Stone Laboratory Certified

( GIA Alumina Association Member )

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Amazing Fibrolite Cat's eye 

Sillimanite is actually trimorphous with Kyanite and Andalusite which means that they have the same chemistry, but different crystal habits create different minerals

Sillimanite is sometimes called "Fibrolite" because of the fibrous nature of the material.