Barringtonite - Occurrence, Properties, and Distribution

Barringtonite was first discovered in Barrington Tops, NSW, Australia. The mineral was named after its place of discovery.

Properties of Barringtonite

The following are the key properties of Barringtonite:

  • Cell Data
    • Space Group: P1 or P1
    • a = 9.155
    • b = 6.202
    • c = 6.092
    • α = 94°00'
    • β = 95°32'
    • γ = 108°42'
    • Z = [4]
  • Crystal Data
    • Triclinic
    • Point Group: 1 or 1
    • As needles and radiating fibers, to 0.03 mm, in nodular incrustations
    • X-ray Powder Pattern: 8.682 (vs), 3.093 (vs), 2.936 (vs), 6.087 (s), 5.816 (s), 2.495 (s), 2.309 (s)
  • Chemical Composition
    Elements Content 1 Content 2 Content 3
    CO2 34.8 36.5 36.57
    H2O 33.4 30 29.94
    MgO 31.8 33.5 33.49
    Total 100 100 100
  • Optical Properties
    • Optical Class: Biaxial (+)
    • Orientation: Length-slow
    • α = 1.458
    • β = 1.473
    • γ = 1.501
    • 2V(meas.) = 68°–80°
    • 2V(calc.) = 73°44'
  • Estimated Properties
    Electron density Bulk density (electron density)=2.62 g/cm3
    note: Specific gravity of Barringtonite =2.54 g/cm3
    Photoelectric PEBarringtonite = 0.67 barns/electron
    U= PEBarringtonite x ρ Electron density= 1.76 barns/cm3
    Fermion index Fermion index = 0.02
    Boson index = 0.98
    Radioactivity Barringtonite is not radioactive

How to Identify Barringtonite

Barringtonite is a colorless transparent mineral having distinct cleavage and white streak. The mineral can be observed as fibrous, nodular or radial crystals. The density of barringtonite is 2.83 g/cm3.

Global Distribution

Barringtonite is widely distributed in the Rainbow Falls, Sempill Creek, Barrington Tops, New South Wales, Australia.

Occurrence of Barringtonite and Useful Mineral Association

Barringtonite is formed by leaching of magnesium from olivine basalt under a waterfall by meteoric water. It is closely associated with nesquehonite.

References

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