Formula: CaCu[H₃AlSi₂O₉]

Species:

Colour: Blue, cerulean blue

Lustre: Vitreous

Hardness: 5 – 5½

Specific Gravity: 3.25

Crystal System: Monoclinic

Name: Named for the Tohono O’odham Nation of Native American people that live in the area around the type locality. The European name for these people was Papago, but the name has been rejected by the nation.

Type Locality: New Cornelia Mine (Ajo Mine), Ajo, Little Ajo Mountains, Ajo Mining District, Pima County, Arizona, USA