Kyanite is an attractive mineral that has a near sapphire like blue color in some especially nice specimens. Kyanite crystals are difficult to cut because of their variable hardness (along axes 4.5, across 6 and 7) and cleavage. Gem quality kyanite crystals are pale to deep blue, or white, gray, or green. The color is often present in irregular streaks.

Locations:

Gem quality kyanite crystals are found in Burma, Kenya, Brazil and European Alps. Other deposits are Australia, India and USA.
Chemical Composition: Aluminum Silicate
Crystal Structure: Triclinic
Hardness: 4.5 along the axes and 6-7 across the axes
Specific Gravity: 3.68
Refractive Index: 1.71-1.73
Colors: Pale to deep blue, or white, gray, or green.
Luster: Vitreous to pearly

Astrological Relevance:

Kyanite is considered as one of the birthstones for the zodiac signs of Aries (March 21 to April 20), Taurus (April 20 To May 21) and Libra (September 22 to October 23).