Formula: CaCu(AsO₄)(OH)

Species: Arsenates

Colour: Green, yellow-green, greenish yellow; light green to yellowish green in transmitted light.

Lustre: Sub-Vitreous, Greasy, Earthy

Hardness: 4½

Specific Gravity: 4.33

Crystal System: Orthorhombic

Member of: Adelite-Descloizite Group. An end member in the Austinite-Conichalcite Series, the Cobaltaustinite-Conichalcite Series, the Conichalcite-Duftite Series, and the Conichalcite-Tangeite Series.

Name: Named by August Breithaupt and Carl Julius Fritzsche in 1849 from the Greek κουία for “konis” (powder) and χαλκος for “chalkos” (copper) in allusion to its composition and appearance of the mineral at times.

Type Locality: Don Bonete mine, Hinojosa del Duque, Córdoba, Andalusia, Spain

Isostructural with: Hermannroseite