Cesstibtantite – Occurrence, Properties, and Distribution

Cesstibtantite was named after the elements CESium, antimony (STIBium), and TANTalum that appear in the composition. It belongs to the pyrochlore group.

Properties of Cesstibtantite

The following are the key properties of cesstibtantite:

  • Cell Data
    • Space group: Fd3m
    • a = 10.496–10.515
    • Z = 8

  • Crystal Data
    • Cubic
    • Point group: 4/m 3 2/m
    • As cubo-octahedral crystals; granular, to 3mm
    • X-ray powder pattern: 3.04 (10), 1.860 (10), 1.587 (10), 1.012 (10), 3.17 (9), 1.370 (9), 1.017 (9)

  • Chemical Composition
    Elements Content 1 Content 2 Content 3
    Ta2O5 72.0 70.8 72.5
    Sb2O3 13.6 14.2 9.7
    Cs2O 7.3 7.4 5.4
    PbO 1.6 0.8 5.3
    Nb2O5 2.3 2.8 1.2
    Na2O 1.3 1.7 2.4
    H2O - [1.5] [1.2]
    Bi2O3 0.7 0.3 0.6
    CaO 0.1 - 0.6
    SnO - - 0.1
    K2O - 0.0 0.05
    Total 98.9 [99.5] [99.0]

  • Optical Properties
    • Optical class: Isotropic
    • n = > 1.8
    • R: (480) 13.8, (551) 13.6, (589) 13.6, (656) 13.0

  • Estimated Properties
    Electron density Bulk density (electron density) = 5.32 g/cm3
    note: Specific gravity of cesstibtantite = 6.25 g/cm3
    Photoelectric PEcesstibtantite = 793.94 barns/electron
    U=PEcesstibtantite x ρ electron density = 4,226.01 barns/cm3
    Fermion index Fermion index = 0.0001561061
    Boson index = 0.9998438939
    Radioactivity
    Cesstibtantite is not radioactive

How to Identify Cesstibtantite

Cesstibtantite can be identified in the field by its color variations, such as yellow-orange, gray, and black. It is sometimes colorless. Its transparent to opaque form has no cleavage. This mineral has a vitreous - adamantine luster, with white streak. The fracture on this mineral is brittle and uneven.

The density of cesstibtantite is 6.4 - 6.6 g/cm3, with a hardness of 6.5 – approximate to pyrite. It is Fluorescent and cathodoluminescent.

Global Distribution

Cesstibtantite is distributed in the following places:

  • Russia - From the Leshaia pegmatite, Vuoriyarvi carbonatite complex, Kola Peninsula
  • Czech Republic - At the Dobra Voda pegmatite, Velke Mezirici
  • Canada - In the Tanco pegmatite, Bernic Lake, Manitoba
  • Australia - From near Mt. Holland, Western Australia

Occurrence of Cesstibtantite and Useful Mineral Association

Cesstibtantite occurs as a rare accessory in some highly fractionated granite pegmatites.

It is often associated with minerals such as simpsonite, stibiotantalite, microlite, wodginite, tantalite, pollucite, sosedkoite, antimonian microlite, kimrobinsonite, and manganotantalite.

References

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