Editorial Feature

Arupite - Occurrence, Properties, and Distribution

Arupite is a monoclinic-prismatic mineral. It contains phosphorus, oxygen, nickel, manganese, magnesium, iron, and hydrogen. The mineral was first discovered in 1990 from the Santa Catherina iron meteorite. It was named after Hans Henning Arup, Director of the Danish Corrosion Center in Copenhagen, Denmark.

Properties of Arupite

The following are the key properties of Arupite:

  • Cell Data
    • Space Group: [12/m] (by analogy to vivianite)
    • a = 9.889(15)
    • b = 13.225(11)
    • c = 4.645(4)
    • β = 102.41(11)°
    • Z = 2

  • Crystal Data
    • Monoclinic
    • Point Group: 2/m
    • Crystals are short prismatic, to 5µm, in granular aggregates
    • X-ray Powder Pattern: 6.624 (100), 7.878 (26), 4.818 (24), 3.152 (24), 2.922 (23), 3.805 (21), 2.672 (17)

  • Chemical Composition
    Elements Content 1 Content 2
    NiO 40.18 43.92
    P2O5 27.6 27.83
    H2O 27.3 28.25
    FeO 4.53 -
    CoO 0.39 -
    Total 100 100

  • Optical Properties
    • Optical Class: Biaxial
    • Pleochroism: X = blue; Z = colorless
    • α = 1.632(5) (α')
    • β = n.d.
    • γ = 1.680(5) (γ')
    • 2V(meas.) = n.d

  • Estimated Properties
    Electron density Bulk density (electron density)=5.55 g/cm3
    note: Specific gravity of Arupite =5.51 g/cm3
    Photoelectric PEArupite = 10.21 barns/electron
    U= PEArupite x ρ Electron density= 56.70 barns/cm3
    Fermion index Fermion index = 0.004
    Boson index = 0.99
    Arupite is not radioactive

How to Identify Arupite

Arupite is a translucent blue or turquoise-blue colored mineral, having light blue streak and earthy luster. The mineral has good cleavage and a hardness ranging from 1.5 to 2.

Global Distribution

Arupite is widely distributed in the Santa Catherina iron meteorite.

Occurrence of Arupite and Useful Mineral Association

Arupite occurs as a weathering product of a nickel-rich iron meteorite. It is closely associated with magnetite, goethite, hematite, akaganeite, honessite, and reevesite.


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