Crystal System: Monoclinic
Status of Occurrence: Unconfirmed Occurrence
Distribution: Rare
Chemical Composition: Sodium copper carbonate hydrate
Chemical Formula: Na2Cu(CO3)2.3H2O
Method(s) of Verification: 'near Anglesey' by XRD at the Natural History Museum, London (X-ray no. 8504F).

Chemical Group:

  • Carbonates

Geological Context:

  • Supergene: minerals on an artificial substrate
  • Supergene: in situ natural oxidation & weathering deposits
Introduction: a secondary mineral formed through the surface alteration of bronze artifacts in arid environments and as an uncommon secondary mineral in the oxidation zone of polymetallic deposits.
Occurrence in Wales: a specimen sent to the Natural History Museum by K. Williamson for identification proved to be chalconatronite. The locality details are vague, 'near Anglesey' and unfortunately nothing further is known of this discovery. Therefore chalconatronite should be regarded as unconfirmed from Wales.

Key Localities:

There are no key localities for this specimen.


There are no references for this specimen.