Cervandonite-(Ce) – Occurrence, Properties, and Distribution

Cervandonite-(Ce) was named after Pizzo Cervandone, a place on the border between Italy and Switzerland, where the mineral was first discovered.

Properties of Cervandonite-(Ce)

The following are the key properties of cervandonite-(Ce):

  • Cell Data
    • Space group: Cm, C2, or C2/m
    • a = 11.235(4)
    • b = 19.50(2)
    • c = 7.201(3)
    • β = 121.22(3)°
    • Z = 6

  • Crystal Data
    • Monoclinic
    • Point group: m, 2, or 2/m
    • As porous, saddle, or rosette-like, rounded, radial crystal aggregates, to 4mm
    • X-ray powder pattern: 2.8785 (100), 3.2530 (90), 5.390 (80), 3.0847 (80), 2.7867 (60), 2.6964 (50), 3.5750 (40)

  • Chemical Composition
    Elements Content 1 Content 2
    As2O5 20.41 24.18
    SiO2 17.65 15.17
    Fe2O3 15.03 15.53
    TiO2 11.67 11.42
    Ce2O3 10.00 11.63
    Nd2O3 5.16 6.01
    La2O3 5.14 5.65
    FeO 4.51 4.67
    Al2O3 3.60 2.95
    ThO2 2.34 1.92
    UO2 1.35 0.33
    SnO2 1.24 0.00
    Y2O3 0.94 0.86
    CaO 0.25 0.25
    PbO 0.17 0.16
    Total [99.46] [100.73]

  • Optical Properties
    • Optical class: Biaxial
    • Pleochroism: Yellowish, reddish-brown to black
    • n = 1.99-2.00
    • 2V (meas.) = n.d
  • Estimated Properties
    Electron density Bulk density (electron density) = 4.31 g/cm3
    note: Specific gravity of cervandonite-(Ce) = 4.65 g/cm3
    Photoelectric PE Cervandonite-(Ce) = 189.69 barns/electron
    U = PE Cervandonite-(Ce) x ρ electron density = 818.29 barns/cm3
    Fermion index Fermion index = 0.02
    Boson index = 0.98
    Radioactivity
    Cervandonite-(Ce) is radioactive

How to Identify Cervandonite-(Ce)

Cervandonite-(Ce) can be identified in the field by its black color. Its translucent to opaque form has {001} indistinct cleavage. This mineral has an adamantine luster, with brownish-black streak. The fracture on this mineral is brittle–conchoidal.

The hardness of cervandonite-(Ce) is 5 – approximate to apatite.

Global Distribution

Cervandonite-(Ce) is distributed in the following places:

  • Italy - On the east flank of Pizzo Cervandone, Alpe Devero, Val d'Aosta
  • Switzerland - On the west flank of Cherbadung [Pizzo Cervandone], Binntal, Valais

Occurrence of Cervandonite-(Ce) and Useful Mineral Association

Cervandonite-(Ce) occurs in narrow fissure-veins, cutting two-mica gneiss.

It is often associated with minerals such as senaite, chernovite, anatase, muscovite, synchysite, albite, tourmaline, magnetite, hematite, rutile, quartz, and chlorite.

References

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