Kyanite is a relatively “new” stone for the metaphysical community and so was not included in any ancient or medieval lapidaries, texts which describe gemstones and their powers. Likewise, there are no historical legends directly associated with the stone. Kyanite comes in a variety of colors including green and orange. However, the most common color is blue. In fact, the name Kyanite comes from the Greek kyanos, meaning “dark blue.”
Kyanite was formerly known as Disthene, which means “two strengths.” This refers to Kyanite’s unique variable hardness. While most stones can be broken in any direction using roughly the same amount of force, Kyanite has a weaker and a stronger side. When scratched parallel to the lines, it has a MOH’s Hardness of only 4.5, similar in hardness to stones like Astrophyllite or Charoite. However, when it is scratched perpendicular, across the lines, it has a MOH’s Hardness of 6, similar to Pyrite or Sugilite. This means that it is easier to break Kyanite lengthwise, than width-wise.