Rusakovite - Occurrence, Properties, and Distribution

Topics Covered

Introduction to Rusakovite
Properties of Rusakovite
How to Identify Rusakovite
Global Distribution
Occurrence of Rusakovite and Useful Mineral Association
References

Introduction to Rusakovite

Chemical Formula – (Fe+++,Al)5(VO4,PO4)2(OH)9•3(H2O)

Rusakovite is a monoclinic mineral containing vanadium, phosphorus, oxygen, iron, hydrogen, and aluminium. It was first described in 1960 from Balasauskandyk, Kara Tau, Kazakhstan. It was named for Mikhail Petrovich Rusakov, a geologist from Kazakhstan, Russia.

Properties of Rusakovite

The following are the key properties of Rusakovite:

  • Cell Data
    • Space Group: n.d
    • Z = n.d.

 

  • Crystal Data
    • Point Group: n.d
    • In splinter-like lamellae, to several µm, veinlets, reniform concretions, and in crusts
    • X-ray Powder Pattern: 3.21 (10), 2.945 (9), 2.441 (8), 2.140 (7), 1.569 (6), 4.20 (5), 5.17 (4)

 

  • Chemical Composition
    Elements Content 1 Content 2
    Fe2O3 45.00 43.70
    V2O5 16.60 16.13
    H2O+ 13.30 14.60
    P2O5 6.50 5.80
    Al2O3 5.00 5.50
    V2O4 5.00 5.10
    H2O- 5.00 4.80
    SiO2 1.80 2.50
    MgO 1.40 trace
    SO2 1.00 1.70
    CaO 0.30 0.40
    Total 100.90 100.23

 

  • Optical Properties
    • Optical Class: Isotropic, or nearly so; weakly birefringent
    • n = 1.833(4)

 

  • Estimated Properties
    Electron density Bulk density (electron density) = 2.73 g/cm3
    note: Specific gravity of Rusakovite = 2.77 g/cm3
    Photoelectric PERusakovite = 11.67 barns/electron
    U= PERusakovite x ρElectron density = 31.85 barns/cm3
    Fermion index Fermion index = 0.007
    Boson index = 0.992
    Radioactivity
    Rusakovite is not radioactive

How to Identify Rusakovite

Rusakovite can be identified by its yellow-orange or reddish-yellow color. It can be formed as crust-like, or kidney-shaped, aggregates on matrix. The mineral has an earthy luster and ochraceous streak.

The hardness range of rusakovite is 1.5 to 2, and its average density is 2.76 g/cm3.

Global Distribution

Rusakovite is widely distributed in the Balasauskandyk vanadium deposit, north-west Kara-Tau Mountains, southern Kazakhstan.

Occurrence of Rusakovite and Useful Mineral Association

Rusakovite occurs in the oxidized zone of a vanadium-rich carbonaceous shale.

It is closely related to sulfides of V, Pb, Zn, Cu, iron hydroxides, vanadian mica, ferric allophane, cellophane, and apatite.

References

 

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