Crystal System: Orthorhombic
Status of Occurrence: Unconfirmed Occurrence
Chemical Composition: Nickel sulphate hydrate
Chemical Formula: NiSO4.7H2O
Method(s) of Verification: none.
- Supergene: in situ natural oxidation & weathering deposits
Introduction: a green alteration product of nickel-bearing sulphides.
Occurrence in Wales: a 'yellow-green substance' occuring as partial coatings on millerite from the Elled Vein at Bedwellty, Gwent, was reported by North & Howarth (1928) as being a mixture of probable morenosite and an unidentified sulphate. More recently Firth (1971) described oxidized millerite from Tylorstown Colliery coated by morenosite. This green coating on millerite from other coalfield localities has been reported as jamborite. Subsequent X-ray diffraction analysis by the National Museum of Wales (e.g. NMW X-902) has failed to provide a distinct pattern and confirm the identity of morenosite or jamborite. Recent research suggests that these coatings are in fact nickelhexahydrite (P.A. Williams unpublished data).
There are no key localities for this specimen.
- Firth, J.N.M., 1971. The Mineralogy of the South Wales Coalfield. Unpublished Ph.D. thesis, University of Bristol.
- North, F.J. & Howarth, W.E., 1928. On the occurrence of millerite and associated minerals in the Coal Measures of South Wales. Proceedings of the South Wales Institute of Engineers, 44, 325-348.