Mineral Information and Data:

Arupite
Ni3(PO4)2 • 8H2O [CNMNC approved formula]

Named in honot of Hans Henning Arup (1928- ), Director of the Danish Corrosion Center, Copenhagen, Denmark.

IMA status : Approved Species 1990 (IMA1988-008)
CLASSIFICATION 
Dana
(8th edition) :
40.03.06.08  
  (40) Hydrated Phosphates
  (40.03) where (A++)3 (XO4)2 · x(H2O)
  (40.03.06) Vivianite Group
  
Nickel-Strunz
(10th edition) :
08.CE.40
  (08) Phosphates, Arsenates, Vanadates
  (08.C) Phosphates without Additional Anions, with H2O
  (08.CE) With only medium-sized cations, RO4:H2O about 1:2.5
  
Crystal system: Monoclinic System
Point group (H-M): 2/m — prismatic
Unit cell: a = 9.88Å, b = 13.22Å, c = 4.64Å β = 102.41°
Crystal Habit: Crystals are short prismatic, to 5 μm, in granular aggregates.
  
Color: Turquoise-blue to sky-blue
Diaphaneity: Translucent
Luster: Earthy
Hardness (Mohs): 1.5 - 2
Measured Density: 2.85 (calculated) g/cm3
  
Geologic Setting: A weathering product of a nickel-rich iron meteorite.
Mineral Association: Reevesite, honessite, akaganeite, hematite, goethite, magnetite.
  

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