Introduction: a member of the hexahydrite group, dimorphous with retgersite, which forms as secondary coatings associated with nickel-rich mine waters.

Occurrence in Wales: bright green surface alteration on brassy acicular millerite crystals found within clay ironstone nodules in the South Wales Coalfield has traditionally been called morenosite without analytical confirmation. Recent investigations have shown nickelhexahydrite to be present and have failed to detect morenosite (P.A. Williams, unpublished data).

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