Carlosruizite – Occurrence, Properties, and Distribution

Carlosruizite was named after Carlos Ruiz F. (1916–), who was the first Director of the Chilean Geological Survey.

Properties of Carlosruizite

The following are the key properties of carlosruizite:

  • Cell Data
    • Space group: P3c1
    • a = 9.5901(8)
    • c = 27.56(2)
    • Z = 1

  • Crystal Data
    • Hexagonal
    • Point group: 3 2/m
    • As thin pseudorhombohedral platy {0001} crystals with hexagonal outline, modified by {1012}, to < 200µm
    • X-ray powder pattern: 3.561 (100), 3.058 (39), 2.717 (39), 3.082 (32), 13.75 (30), 7.10 (20), 3.974 (16)

  • Chemical Composition
    Elements Content 1
    I2O5 45.6
    SeO3 19.0
    MgO 9.2
    SO3 7.9
    K2O 6.7
    Na2O 4.7
    CrO3 2.5
    H2O n.d.
    Total 95.6

  • Optical Properties
    • Optical class: Uniaxial (-)
    • ω = 1.655(3)
    • ε = 1.642(1)

  • Estimated Properties
    Electron density Bulk density (electron density) = 3.12 g/cm3
    note: Specific gravity of carlosruizite = 3.36 g/cm3
    Photoelectric PECarlosruizite = 134.75 barns/electron
    U=PECarlosruizite x ρ electron density = 420.07 barns/cm3
    Fermion index Fermion index = 0.01
    Boson index = 0.99
    Radioactivity
    Carlosruizite is radioactive (barely detectable)

How to Identify Carlosruizite

Carlosruizite can be identified in the field by its pale yellow color. It is sometimes colorless. Its transparent form has {110} good cleavage. This mineral has a vitreous luster with white streak. The fracture on this mineral is brittle.

The density of carlosruizite is 3.42 g/cm3, with a hardness of 2.5 to 3 - between finger nail and calcite.

Global Distribution

Carlosruizite is distributed mainly in Chile from near Zapiga, Tarapaca.

Occurrence of Carlosruizite and Useful Mineral Association

Carlosruizite occurs in a rare constituent of nitrate ores.

It is often associated with minerals such as Iquiqueite, nitratine, halite, darapskite, and residues containing dietzeite, bruggenite, tarapacaite, ulexite, probertite, lopezite, and gypsum after leaching in water.

References

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