Kyanite or Disthenes (mineral)

Kyanite crystals, a selection of specimens of this crystallized mineral species. Disthenite is a mineral, and here you’ll find a number of collector’s items presented with a description, one or more photos and sometimes a video. These disthenes are for sale.
It is a silicate, of the mesosilicate subgroup, with the chemical formula Al₂SiO₅ and the triclinic crystal system.