- Arequipa, Arequipa Province, Arequipa Department, Peru
- Small Cabinet, 9.0 x 8.5 x 5.0 cm
- Ex. Philadelphia Academy of Natural Sciences
Hayesine is a discredited species name now shown to be the same as the previously described species Ulexite. This is, however, a very fine, rich, and large example of ulexite from Peru! It is crystallized in globular clusters, and complete all around.