Kyanite, also known as disthene, is an alumino-silicate mineral (Al2SiO5), crystal system triclinic. It occurs in metamorphic rocks, in which it stands out by its softly blue colour and the acicular to fibrous crystal habitat. It has industrial uses in refractory and ceramic products. Provenance of this specimen is Morbihan, Brittany, France. Overall width is 210 mm.