Thumbnail, 0.8 x 0.7 x 0.7 cm
Boleo, Baja California Sur, Mexico

This single crystal of Boleite has the typical cubic shape and famous iridescent azure blue color that the mineral is famous for. A very good thumb remarkable for its sharpness - most of this size start to accumulate a coating of pseudoboleite faces on the square faces of the boleite, distorting the cube over time.