Formula: Cu8(SO4)4(CO3)(OH)6 · 48H2O
From Alfredo Petrov:
NAKAURIITE (nakauri-seki)
- Aichi: The type locality for this very hydrous copper sulfate-carbonate is the Nakauri nickel-copper mine, where it forms abundant light blue films or aggregates of sky blue or bluish white, fibrous to minute acicular crystals individually up to 0.2mm long and 0.006mm wide, sometimes as radial sprays, in narrow fractures in serpentinite formed by alteration of gabbro; associated with chrysotile, artinite, pyroaurite, brochantite and malachite. The serpentinite host rock contains djurleite and native copper. The tunnels of this mine, closed over 60 years ago, are still accessible but extremely dangerous; cave-ins have occurred after minor earthquake tremors of as little as magnitude 2!
- Saitama: At Ninomiya (of different colour shade than at the type locality).
Above: Nakauriite, Nakauri mine, Shinshiro city, Aichi Prefecture, Japan. Width of view 6mm.
