Nakauriite ore displayed at Mining Museum of Akita University — Photo: 掬茶 · CC BY-SA 4.0
Nakauriite
Nakauriite is an IMA-recognized mineral species in the sulfate class, with the chemical formula Cu₈(SO₄)₄(CO₃)(OH)₆·48H₂O.
It crystallizes in the orthorhombic crystal system.
Key properties: specific gravity 2.39; optically biaxial.
IMA symbol Nak, IMA status: approved, named in 1976.
Occurs as fracture fillings in serpentinite (Nakauri, Japan); on chromatite from serpentinite (Hagdale quarry, Scotland).
It is found associated with Chrysotile, magnetite, artinite, pyroaurite, brochantite, malachite (Nakauri, Japan); callaghanite, hydromagnesite (Gabbs, Nevada, USA); antigorite, magnesite.
The name refers to the original material found at Nakauri, Japan.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet.
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