Kyanite is very anisotropic, meaning it has a different hardness depending on the angle. Its vertical hardness ranges from 4.5 to 5.5, while the horizontal hardness is from 6 to 7 on the Mohs scale. This characteristic of the mineral led to it being commonly called “disthene”, meaning two strengths.

Kyanite is named from the Greek term cyanos, meaning deep blue.

6.5 x 5 x 10 Inches

This Item is Not Eligible for Shipping and is Curbside Pickup Only from the Hermann Park Museum location in Houston.

FREE Standard Shipping on all Continental U.S. orders of $125 or more.
All other Orders ship for a Flat-Fee of $12.95

For more information, please see our Shipping Policy.