Calcjarlite – Occurrence, Properties, and Distribution

Topics Covered

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

Introduction to Calcjarlite

Chemical Formula – Na(Ca, Sr)3Al3(F,OH)16

Calcjarlite was named after its chemical relationship to jarlite, which contains CALCium instead of sodium.

Properties of Calcjarlite

The following are the key properties of calcjarlite:

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

 

  • Crystal Data
    • [Monoclinic]
    • Point group: n.d
    • As elongated tabular crystals in radial aggregates, to 2mm
    • X-ray powder pattern: 2.96 (10), 3.04 (7), 3.16 (6), 3.51 (5), 2.23 (4), 2.15 (4), 3.44 (3)

 

  • Chemical Composition
    Elements Content
    F 47.50
    Al2O3 26.46
    -O = F2 19.95
    CaO 17.40
    SrO 11.33
    Na2O 4.78
    BaO 4.46
    MgO 4.21
    H2O+ 3.10
    K2O 0.97
    H2O- 0.00
    Total 100.26

 

  • Optical Properties
    • Optical class: Biaxial (+)
    • Orientation: Z ^ c = 15°
    • α = 1.425(1); β = 1.428(1); γ = 1.432(1)
    • 2V(meas.) = 72°

 

  • Estimated Properties
    Electron density Bulk density (electron density) = 3.15 g/cm3
    note: Specific gravity of calcjarlite = 3.27 g/cm3
    Photoelectric PECalcjarlite = 15.75 barns/electron
    U = PECalcjarlite x ρ electron density = 49.58 barns/cm3
    Fermion index Fermion index = 0.0085512963
    Boson index = 0.9914487037
    Radioactivity
    Calcjarlite is not radioactive

How to Identify Calcjarlite

Calcjarlite can be identified in the field by its white color, and white streak. It has no cleavage. The fracture on this mineral is uneven.

The density of calcjarlite is 3.51 g/cm3, with a hardness of 4 – approximate to fluorite.

Global Distribution

Calcjarlite is distributed in the following places:

  • Russia - Near the mouth of the second tributary to the Pravaya Noyba River, tributary to the Teya River, Yenisei Ridge, Siberia
  • USA - Colorado, El Paso Co. Cheyenne District (St. Peters Dome District) St Peters Dome, Cryolite Mine (65-2 pegmatite)

Occurrence of Calcjarlite and Useful Mineral Association

Calcjarlite occurs in a fluorite vein in quartz-mica schists.

It is often associated with minerals such as fluorite, halloysite, erionite, thorite, usovite, chamosite, phillipsite, and micas.

References

 

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