Cesanite – Occurrence, Properties, and Distribution

Cesanite was named after the place of its discovery: near Cesano, Italy.

Properties of Cesanite

The following are the key properties of cesanite:

  • Cell Data
    • Space group: P63/m
    • a = 9.446(1)
    • b = 6.895(1)
    • Z = 2

  • Crystal Data
    • Hexagonal
    • Point group: 6/m
    • As rare, striated subhedral hexagonal prismatic crystals, to 1.5mm, exhibiting {1010}, {0111}, {0001}
    • Commonly granular
    • Twinning: On {1010}, uncommon
    • X-ray powder pattern: 2.727 (100), 3.448 (87), 1.844 (71), 3.896 (66), 2.822 (60), 2.636 (49), 2.269 (47)

  • Chemical Composition
    Elements Content 1
    SO3 52.6
    Na2O 23.3
    CaO 18.9
    H2O 2.91
    SrO 0.72
    Cl 0.44
    F 0.25
    K2O 0.21
    -O = (F, Cl)2 0.21
    Total 99.12

  • Optical Properties
    • Optical class: Uniaxial (-)
    • ω = 1.570(2)
    • ε = 1.564(2)

  • Estimated Properties
    Electron density Bulk density (electron density) = 2.77 g/cm3
    note: Specific gravity of cesanite = 2.79 g/cm3
    Photoelectric PE Cesanite = 3.26 barns/electron
    U = PE Cesanite x ρ electron density = 9.04 barns/cm3
    Fermion index Fermion index = 0.0020291221
    Boson index = 0.9979708779
    Radioactivity
    Cesanite is not radioactive

How to Identify Cesanite

Cesanite can be identified in the field by its white color. It is sometimes colorless. Its transparent form has a white streak.

The density of cesanite is 2.786 g/cm3, with a hardness of 2 to 3 - between gypsum and calcite.

Global Distribution

Cesanite is distributed mainly in Italy, from a drill core at the edge of the Baccano caldera, Cesano geothermal field, east of Lake Bracciano, Lazio.

Occurrence of Cesanite and Useful Mineral Association

Cesanite occurs as vein and cavity fillings in brecciated rock in an active geothermal field.

It is often associated with minerals such as gorgeyite, glauberite, gypsum, pyrite, anhydrite, aphthitalite, and kalistrontite.

References

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