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Kyanite Information

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There are three polymorphs of Al2SiO5: andalusite, kyanite and sillimanite. Each of these minerals has the same chemical composition but differing crystal structure.

These three minerals form in aluminous metamorphic rocks. The temperature and pressure are what determines which of these polymorphs will crystallize. Knowing the pressure and temperature stability field for each of these three minerals can be of significant value in understanding metamorphic terrains. Under conditions of high temperature regional metamorphism, sillimanite tends to occur from rocks of appropriate composition. Kyanite crystals are typically found in rocks that formed under conditions of high pressure regional metamorphism. Andalusite is indicative of relatively low pressure conditions of formation, often occuring in contact metamorphic deposits.

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Kyanite crystals most often form in high pressure regionally metamorphosed aluminous rocks and in the quartz veins that cut through them, associated with quartz, muscovite mica, almandine garnet, biotite, staurolite and corundum. It also occurs in some kimberlite pipes and eclogites associated with pyrope garnet and omphacite.

The blue color in metamorphic kyanite is due to trace amounts of Fe+2 and Ti+4 impurities substituting for aluminum. The light blue color of kyanites found in kimberlites is due to trace amounts of chromium.

Kyanite is characterized by its blue color, differing hardnesses in different directions, perfect cleavage, and the blade-like form of Kyanite Crystals.

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Kyanite Jewelry Kyanite Gemstones The name kyanite is from the Greek word kyanos, meaning blue.

Ground up kyanite crystals are used in the manufacture of spark plugs and other heat resistant ceramics.
Kyanite gemstones of fine color and transparency are rare. Because kyanite's well developed cleavage and relatively low hardness and make it comparatively easy to damage, the use of kyanite as a gemstone is limited mostly pendants, earrings, and necklaces.

The astrological signs of kyanite are Aires, Taurus, and Libra.

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Wearing Kyanite jewelry (or holding a Kyanite Crystal) is said to be very useful in enhancing one's creativity, broadening one's perspective, and in reaching a better understanding with others. Kyanite is also said to bring calm and tranquility, and to facilitate meditation.

Kyanite is said to help clear sinus congestion, and to help in the treatment of muscular disorders.

For more in-depth metaphysical information, see our Metaphysical Books section.

This is the end of our Kyanite Factsheet and Information page.

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Last Updated: August 7, 2016
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