Sillimanite Gemstone




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Physical Features:
ChemicalAl2SiO5
ColorColorless, blue-green, blue, green, gray-green, brownish
Crystal Habit Prismatic
Crystal System Orthorhombic
CleavagePerfect
FractureSplintery
Hardness6.5 - 7.5 Mohs scale
LusterVitreous, silky
StreakWhite
TransparencyTransparent, Translucent
Specific gravity3.20 - 3.26
Refractive index1.653 - 1.685
Birefringence0.014 - 0.021
ChatoyancyYes

Sillimanite is an Aluminosilicate mineral which is composed of Aluminum, Silicon, Oxygen, and others. It is actually a polymorph containing both Kyanite and Andalusite. Among the two of this Sillimanite is the rarest form of the known gemstone but, neither it has any astrological connection neither nor it is a birthstone. But according to mythology, wearing Sillimanite will give you good vibes while wearing it can be helpful for old aged people for healing purposes. Sillimanite is generally known for its cats eye chatoyancy that is varying in color when seen in different lights or from different angles. It also increases the number of buyers as well in the jewelry trade for having that cats eye lookalike.

Its uses and purpose

It can be used as a gemstone

Artificial imitation of Sillimanite can be made using dyes.

Most of the Sillimanite is used as refractory raw material in the industries. The term refractory means that it will remain stable at all physical and chemical conditions.

Used in producing refractory bricks and gunning mixtures.

End material of Sillimanite is used in the iron industry for furnaces, steel degassing chambers, soaking pits.

Mullite is an important component that is present in the Sillimanite which remains stable until the temperature is raised above 18000C therefore it used in the manufacture of metals, glass ceramics, and cement.

Sillimanite is most commonly used for industrial purposes. It is the best material for shaping other materials. It is believed that it protects the user from past, present, and future bad effects and if used properly it can also improve eye sight, cataracts, and other eye related problems.

Sillimanite can withstand high temperatures and is of great use in the iron industry for the lining of furnaces.

Even though Sillimanite is highly cost effective it's better not to compromise it with any other stone as it provides better results than rest.