Aerugite – Occurrence, Properties, and Distribution

Aerugite was named by Gilbert-Joseph Adam in 1869, from the Greek word aerugo, which means copper rust, in allusion to its appearance.

Properties of Aerugite

The following are the key properties of Aerugite:

  • Cell Data
    • Space group: R3m (synthetic)
    • a = 5.9511(5)
    • c = 27.5676(20)
    • Z = 1

  • Crystal Data
    • Hexagonal
    • Point group: 3 2/m
    • Fine-grained crystalline
    • Massive
    • As crusts, to 2mm thick
    • X-ray powder pattern: 2.060 (vvs), 3.76 (vs), 2.329 (s), 5.05 (s), 2.862 (s), 2.492 (s), 1.485 (s)

  • Chemical Composition
    Elements Content 1 Content 2 Content 3 Content 4
    NiO 62.07 60.9 61.3 64.81
    As2O5 36.57 36.3 37.6 35.19
    CoO 0.54 1.2 0.7 -
    CuO 0.34 0.3 0.7 -
    Bi2O3 0.24 -
    FeO - 1.3 0.6 -
    P2O5 0.14 - - -
    Fe2O3 trace - - -
    Total 99.90 [100.0] 100.9 100.00

  • Optical Properties
    • Semi-transparent
    • ω = n.d
    • ε = n.d

  • Estimated Properties
    Electron density Bulk density (electron density) = 5.46 g/cm3
    note: Specific gravity of Aerugite = 5.76 g/cm3
    Photoelectric PEAerugite = 37.82 barns/electron
    U = PEAerugite x ρ electron density = 206.47 barns/cm3
    Fermion index Fermion index = 0.0062
    Boson index = 0.9937
    Radioactivity
    Aerugite is not radioactive

How to Identify Aerugite

Aerugite can be identified in the field by its color variations, such as deep blue-green, and green. It is opaque and non-magnetic, and its encrustations form crust-like aggregates on matrix. This mineral has a greenish-white streak.

The density of aerugite is 5.85 to 5.95 g/cm3, with a hardness of 4 – approximate to fluorite.

Global Distribution

Aerugite is distributed in the following places:

  • Germany - From Johanngeorgenstadt, Saxony
  • England - South Terras mine, St. Stephen-in-Brannel, Cornwall

Occurrence of Aerugite and Useful Mineral Association

Aerugite occurs in a rare secondary mineral in hydrothermal Ni–As–U ore deposits.

It is often associated with minerals such as bismuth, bunsenite, xanthiosite, and xanthiosite.

References

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