Ajoite is a rare and beautiful mineral that is usually found in association with other rare secondary copper minerals such as Papagoite and Shattuckite. A single specimen containing these minerals together is an amazing and beautiful combination of colors. Ajoite forms as excellent microcrystal specimens and occassionally as relatively large masses or veins in Quartz that can be fassioned into beautiful cabochons.

Ajoite is only found in a few locations worldwide. Of course it is found at the type locality New Cornelia Mine, Ajo, Pima County, Arizona and also at Wickenburg, Maricopa County, Arizona, USA; Munihuaza, near Alamos, Sonora, Mexico; and Messina, Transvaal, South Africa.

Chemical Formula: (K;Na)Cu7AlSi9O24(OH)6 · 3(H2O)
  Hydrated Potasium Sodium Copper Aluminum Silicate Hydroxide
Molecular Weight: 3,926.74 gm
Composition: Potassium 2.24 % K 2.70 % K2O
  Sodium 1.02 % Na 1.38 % Na2O
  Aluminum 2.06 % Al 3.89 % Al2O3
  Copper 32.37 % Cu 40.51 % CuO
  Silicon 20.74 % Si 44.37 % SiO2
  Hydrogen 0.82 % H 7.34 % H2O
  Oxygen 40.74 % O    
    100.00 %   100.00 % = TOTAL OXIDE
Crystallography: Triclinic – Pinacoidal
Crystal Habit: As sprays of bladed prismatic crystals, to 0.4 mm; commonly fibrous; Lath – Shaped like a small, thin plaster lath, tabular (rectangular) in shape; Massive – Uniformly indistinguishable crystals forming large masses; Platy – Sheet forms (e.g. micas)
Twinning: None
Cleavage: Perfect on [010]
Fracture: n/a
Tenacity: Brittle
Moh’s Hardness: 3.5
Density: 2.96 (g/cm3)
Luminescence: None
Radioactivity: Barely Detectable; GRapi = 31.60 (Gamma Ray American Petroleum Institute Units)
Color: Bluish Green, Light Green
Transparency: Translucent
Luster: Vitreous (Glassy)
Refractive Index: 1.550 – 1.641  Biaxial ( + )
Birefringence: 0.0910
Dispersion: Strong, r < v
Pleochroism: Visible; X = very light bluish green; Y = Z = brilliant bluish green