Editorial Feature

Kamaishilite - Occurrence, Properties, and Distribution

Kamaishilite is a tetragonal colorless mineral containing silicon, oxygen, hydrogen, calcium and aluminium. It was first discovered from Kamaishi mine, Kamaishi, Iwate Prefecture, Honshu, Japan in 1981. It was named for its area of discovery.

Properties of Kamaishilite

The following are the key properties of Kamaishilite:

  • Cell Data
    • Space Group: Body-centered cell
    • a = 8.850
    • c = 8.770
    • Z = 4
  • Crystal Data
    • Tetragonal
    • Point Group: n.d
    • As grains up to about 0.1 mm
    • X-ray Powder Pattern: 3.607 (100), 2.799 (85), 2.777 (40), 2.547 (40), 1.557 (35), 2.085 (30).
  • Chemical Composition
    Elements Content
    CaO 37.42
    Al2O3 34.15
    SiO2 20.03
    H2O+ 6.1
    H2O- 0.2
    FeO 0.21
    MgO 0.02
    Total 98.13
  • Optical Properties
    • Optical Class: Isotropic, nearly
    • n = 1.629
  • Estimated Properties
    Electron density Bulk density (electron density)=2.83 g/cm3
    note: Specific gravity of Kamaishilite =2.83 g/cm3
    Photoelectric PEKamaishilite = 4.28 barns/electron
    U= PEKamaishilite x ρElectron density= 12.10 barns/cm3
    Fermion index Fermion index = 0.005
    Boson index = 0.99
    Radioactivity Kamaishilite is not radioactive

How to Identify Kamaishilite

Kamaishilite is a colorless, transparent mineral having white streak and vitreous luster. It can be formed as microscopic crystals. The relative density of kamaishilite is 2.83 g/cm3.

Global Distribution

Kamaishilite is widely distributed in the Kamaishi mine, Iwate Prefecture, Japan.

Occurrence of Kamaishilite and Useful Mineral Association

Kamaishilite occurs in vesuvianite skarn in a marble. It is closely associated with minerals like chalcopyrite, magnetite, calcite, perovskite and vesuvianite.

References

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