Boleite is a highly attractive, though uncommon, blue mineral that forms in very distinct crystal habits. Its crystals can be perfectly cubic, both in individual isolated crystals, and may be perched on fragile matrix. Boleite may also form together with the minerals Pseudoboleite and Cumengeite as epitaxial overgrowths, in mineralogically fascinating examples. These similar minerals form together in a single specimen with an inner cubic core of Boleite, and outer protruding portions either Pseudoboleite (additional protruding square faces) or Cumengeite (triangular faces in a star-like formation.)

Boleite has been found in several localities worldwide, however, its only significant source was the the Amelia Mine in Baja California, Mexico. To date, this is the only only locality that had produced this mineral in large, well-formed crystals, as well as the uncommon epitaxial overgrowths.