Formula: (K,Na)Cu₇AlSi₉O₂₄(OH)₆ · 3H₂O

Species:  Silicates – (Phylosilicates)

Colour: Bluish green

Specific Gravity: 2.96

Crystal System: Triclinic

Name: Named after the type locality, the New Cornelia mine in Ajo, Arizona, USA

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

Ajoite is a hydrated sodium potassium copper aluminium silicate hydroxide mineral. Ajoite contains minor Mn, Fe and Ca in the structure. Ajoite is used as a minor ore of copper. Ajoite is a secondary mineral that forms from the oxidation of other secondary copper minerals in copper-rich base metal deposits in massive fracture coatings, in vein fillings, and in vugs. It may form from shattuckite and also it may be replaced by shattuckite.