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 Recent research suggests that these coatings are in fact nickelhexahydrite (P.A. Williams unpublished data).

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