Beudantite - Occurrence, Properties, and Distribution

Beudantite is a secondary mineral that was first described in 1826 for an occurrence in the Louise Mine, Wied Iron Spar District, Westerwald, Rhineland-Palantinate, Germany. It was named after French mineralogist Francois Sulpice Beudant.

Properties of Beudantite

The following are the key properties of Beudantite:

  • Cell Data
    • Space Group: R3m
    • a = 7.315–7.339
    • c = 17.034–17.036
    • Z = 3.
  • Crystal Data
    • Hexagonal, pseudocubic
    • Point Group: 3 2/m. As tabular crystals, pseudocubes, or pseudo-octahedra, to 5 mm; also microcrystalline massive
    • X-ray Powder Pattern: 3.078 (100), 2.865 (80), 2.290 (70), 5.725 (50), 3.108 (50), 5.089 (45), 1.979 (35).
  • Chemical Composition
    Elements Content 1 Content 2
    Fe2O3 33.48 33.65
    PbO 31.22 31.36
    As2O5 16.02 16.15
    SO3 11.15 11.25
    H2O 7.8 7.59
    CuO 0.22 -
    ZnO 0.11 -
    Total 100 100
  • Optical Properties
    • Optical Class: Uniaxial (–), commonly anomalously biaxial
    • Pleochroism: O = yellow to red-brown; E = colorless to yellow
    • ω = 1.957
    • ε = 1.943.
  • Estimated Properties
    Electron density Bulk density (electron density) = 3.86 g/cm3
    note: Specific gravity of Beudantite = 4.20 g/cm3
    Photoelectric PEBeudantite = 501.54 barns/electron
    U = PEBeudantite x ρ Electron density = 1935.52 barns/cm3
    Fermion index Fermion index = 0.06
    Boson index = 0.94
    Radioactivity

    Beudantite is not radioactive.

How to Identify Beudantite

Beudantite is an orange, dark green, yellow, green or brown mineral having transparent to translucent appearance, non-fluorescent characteristic, adamantine luster and greenish yellow streak.

This mineral exhibits brittle fractures as displayed by glasses and most of the non-metallic minerals. It can be formed as rhombohedral crystals or platy structures. The average density of the mineral is 4.19 g/cm3, and its hardness is 4.

Global Distribution

Beudantite is distributed in the following places:

  • Louise mine, Horhausen, and the Schone Aussicht mine, near Dernbach, Rhineland-Palatinate, Germany
  • Reichenbach, near Bensheim, Hesse; from the Clara mine, near Oberwolfach, and elsewhere in the Black Forest, Germany
  • Cap Garonne mine, near le Pradet, Var, and Blond, near Vauly, Haute-Vienne, France
  • Caldbeck Fells, Cumbria, and in Cornwall, England
  • Laurium, pure masses in the Kamariza mine, and in the slags, Greece
  • Tsumeb, Namibia
  • Ojuela mine, Mapim´i, Durango, and at La Mur, Trincheras, Sonora, Mexico
  • Mohawk mine, Clark Mountains, San Bernardino Co., California
  • Bisbee, Cochise Co., Arizona, USA
  • Belvedere Au–Pb mine, near Mt. McGrath, Western Australia.

Occurrence of Beudantite and Useful Mineral Association

Beudantite occurs as a secondary mineral in the oxidized zone of polymetallic deposits. It is closely associated with azurite, cerussite, anglesite, duftite, bayldonite, olivenite, pharmacosiderite, arseniosiderite, dussertite, mimetite, scorodite and carminite.

References

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