Pale green blue crystals of the extremely rare nickel mineral arupite from the type locality (Santa Catharina Meteorite, Morro do Rócio, São Francisco do Sul, Santa Catarina, Brazil), one of the two known localities worldwide. — Photo: David Hospital · CC BY-SA 4.0
Arupite
Arupite is an IMA-recognized mineral species in the phosphate class, with the chemical formula Ni₃(PO₄)₂·8H₂O.
It crystallizes in the monoclinic crystal system (space group I2/m). It is a member of the Vivianite structural group.
Key properties: Earthy luster; optically biaxial.
IMA symbol Arp, IMA status: approved, named in 1988.
A weathering product of a nickel-rich iron meteorite.
It is found associated with Reevesite, honessite, akaganeite, hematite, goethite, magnetite.
The mineral was named to honor Hans Henning Arup (1928-), Director of the Danish Corrosion Center, Copenhagen, Denmark.