Crystal System: Monoclinic
Status of Occurrence: Unconfirmed Occurrence
Distribution: Rare
Chemical Composition: Hydrated copper cobalt arsenate hydroxide
Chemical Formula: (Cu,Co)5(AsO4)2(AsO3OH)2.10H2O
Method(s) of Verification: Cwmavon Valley Copper Smelting Slags - XRD (NHM, London, 12010) this mineral is of close similarity to lindackerite, further analysis is required for full verification.

Geological Context:

  • Supergene: minerals on an artificial substrate
Introduction: lindackerite is an extremely rare secondary mineral known from only a small number of locations worldwide. It typically occurs in the oxidized zone of some arsenic-rich copper deposits, but also as an oxidation product of copper-rich slag.
Occurrence in Wales: some doubt remains over the identification of lindackerite from Wales. Plant (2003) records a mineral bearing a close similarity to lindackerite from copper slag in South Wales, on the basis of X-ray analysis. Further analysis is required to ascertain the true identity, but if verified as lindackerite, this would represent the first occurrence of this mineral within oxidized slag.

Key Localities:

  • Cwmavon Valley Copper Smelting Slags, Aberavon, South Wales: described by Plant (2003) as forming aggregates of radiating finely acicular crystals encrusting cavities within particularly copper-rich slag. The colour shows zonation from apple-green to almost colourless. Lavendulan is the most commonly associated mineral.


  1. Plant, S., 2003. Secondary minerals from the Cwmavon Valley Copper Smelting Slags, Glamorgan, South Wales. Journal of the Russell Society, 8(1), 9-15.