Natural Fibrolite - Danu Group Gemstones
FibroliteĀ is anĀ aluminosilicateĀ mineralĀ with theĀ chemical formulaĀ 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.
Rare Natural Sillimanite ā FibroliteĀ Colour : Light Green Shape : Cushion Weight : 13.66 Cts Dimension : 18.0 x 11.9 x 7.1 mm Treatment : U
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 inĀ glassindustries. Sillimanite is the best raw material for the manufacture of highĀ aluminarefractories or 55-60% alumina bricks.Ā 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 Γ = 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 š±š°
⢠CSL - Colored Stone Laboratory Certified
( GIA Alumina Association Member )
All orders are shipped through the Sri Lankan National Gem and Jewelry Authority with insurance. We will provide you with a tracking number as soon as the order is shipped. Please message us if you have any additional questions. We are always ready to give you better customer service all the time
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