Ball-and-stick model of the unit cell of the mineral kernowite, Cu₂Fe(AsO₄)(OH)₄·4(H₂O), based on the crystal structure of the isostructural mineral liroconite. The structure of liroconite was determined by single-crystal X-ray diffraction and reported in Acta Cryst. C (1991) 47, 916-919 (COD entry 9007883, AMCSD entry 11889).

Colour code:

  Copper, Cu: orange-brown

  Iron, Fe: blue-grey

  Arsenic, As: lilac

  Oxygen, O: red

  Water, H₂O: pale green