Found mainly in metamorphic settings such as schists and gneisses, Kyanite forms from the high-pressure alteration of clay minerals. Kyanite is unique in that it holds its strength at high temperatures and can expand significantly when heated, unlike other minerals. Its high refractory strength makes Kyanite an important mineral in the automotive/railroad industry. Also useful in the making of ceramics and porcelain. Kyanite can be found throughout the world; Switzerland, Brazil, Russia, Nepal, Kenya, Tanzania, and the US supply Kyanite in varying hues of blue from light blue to indigo.. It is an important collector’s mineral due to its beautiful color and ease of obtaining. With intense shades of blue and well-formed large, long, and slender-bladed crystals, Kyanite is a sought-after mineral. Stemming from the Greek word “cyanos”, meaning deep blue, Kyanite’s color attracts many worldwide. Also known as Rhaeticide, Cyanite, and Disthene (meaning two strengths). Other unique properties include Kyanite’s anisotropism; exhibiting different hardnesses on the perpendicular axis. Kyanite as a gemstone is exotic and rare, high-quality, and nicely colored. It can be cut into attractive cabochons and faceted stones, to be used as rings and pendants. Kyanite gemstones can be challenging to cut due to their anisotropism and skilled cutters are needed to work with these stones. Some Kyanite gemstones are pleochroic, appearing to be different colors when viewed from different directions.
