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Kyanite

Kyanite and Moonstone Bracelet.
Kyanite and Moonstone Bracelet.

Kyanite occurs in light to deep blue, white, gray, or green colors. Forming in pegmatite veins within metamorphic rock as well as in gneiss and schist, it can be weathered into alluvial deposits. Gem-quality specimens come from Myanmar, Brazil, Kenya, Madagascar, Mozambique and Montana. India, Australia, and some U.S. locations boast alluvial deposits. The hardness of this mineral varies according to the direction of cleavage with an increase in hardness perpendicular to the cleavage direction.

Gemological Information for Kyanite

Color:Light to Dark Blue, Colorless, Gray or Brown (Banded with Blue)
Crystal Structure:Triclinic
Refractive Index:1.716 – 1.731
Durability:Poor
Hardness:6 to 7.5 or 4 to 5 (Depending on Angle)
Family:
Similar Stones:Idocrase, Epidote, Sapphire, Tanzanite, Spinel
Treatments:None Known at this Time
Country of Origin:U.S., Russia, India, Pakistan, Myanmar, Kenya, Brazil

Kyanite Care

Ultrasonic Cleaning:Never
Steam Cleaning:Never
Warm Soapy Water:Safe
Chemical Attack:Not Attacked
Light Sensitivity:Stable
Heat Sensitivity:Sensitive

Sources 

  • Gem Reference Guide, Los Angeles: Gemological Institute of America, 1988.
  • Hall, Cally. Gemstones, Smithsonian Handbooks. London, DK Penguin Random House, 2021.
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