Chiolite - Occurrence, Properties, and Distribution

Chiolite is a tetragonal-ditetragonal dipyramidal mineral, composed of sodium, fluorine, and aluminum. The mineral was first discovered from Minask in the Ilmen Mountains, Russia, in 1846.

It was named from the Greek word for snow and stone, due to its similarity in appearance to cryolite.

Properties of Chiolite

The following are the key properties of Chiolite:

  • Cell Data
    • Space Group: P4/mnc
    • a = 7.00–7.01
    • c = 10.39–10.41
    • Z = 2

  • Crystal Data
    • Tetragonal
    • Point Group: 4/m 2/m 2/m
    • Crystals, to 10cm, dipyramidal {111}, with {001} and {114}; commonly granular, massive
    • Twinning: On {011}
    • X-ray Powder Pattern: 2.91 (100), 5.18 (80), 2.32 (70), 1.99 (70), 1.79 (70), 1.75 (70), 1.55 (70)

  • Chemical Composition
    Elements Content 1 Content 2 Content 3
    Na 24.97 24.79 24.89
    Al 17.66 17.54 17.53
    F 57.30 57.81 57.58
    H2O- - 0.23 -
    Total 99.93 100.37 100.00

  • Optical Properties
    • Optical Class: Uniaxial (–)
    • ω = 1.3486
    • ε = 1.3424

  • Estimated Properties
    Electron density Bulk density (electron density) = 2.87 g/cm3
    note: Specific gravity of Chiolite = 3.01 g/cm3
    Photoelectric PEChiolite = 1.19 barns/electron
    U = PEChiolite x ρElectron density = 3.43 barns/cm3
    Fermion index Fermion index = 0
    Boson index = 1
    Radioactivity
    Chiolite is not radioactive

How to Identify Chiolite

Chiolite is a transparent, colorless or snow-white mineral, having vitreous luster, perfect cleavage, and white streak.

The average density of chiolite is 2.87 g/cm3, and its hardness ranges from 3.5 to 4.

Global Distribution

Chiolite is distributed in the following places:

  • Miass, Ilmen Mountains, Southern Ural Mountains, Russia
  • Ivigtut cryolite deposit, southwestern Greenland
  • Morefield pegmatite mine, Amelia, Amelia Co. Virginia

Occurrence of Chiolite and Useful Mineral Association

Chiolite occurs in some granite pegmatites, and is associated with ralstonite, thomsenolite, pachnolite, elpasolite, cryolite, thomsenolite, cryolithionite, fluorite, phenakite, and topaz.

References

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