Jun 11 2014
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:
- 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