Jun 12 2014
Agrinierite was named by Henri Agrinier, an engineer at the Mineralogy Laboratory of the French Atomic Energy Commission in Paris, France.
Properties of Agrinierite
The following are the key properties of agrinierite:
- Cell Data
- Space group: Cmmm, Cm2m, Cmm2, or C222
- a = 14.04
- b = 24.07
- c = 14.13
- Z = [16]
- Crystal Data
- Orthorhombic, pseudohexagonal
- Point group: 2/m2/m2/m, mm2, or 222
- Tabular on {001}, pseudohexagonal in section
- Twinning: Sector twinning with composition plane {110}
- X-ray powder pattern: 7.08 (vvs), 3.128 (vvs), 3.485 (vs), 3.153 (vs), 3.516 (s), 2.023 (s), 6.05 (ms)
- Chemical Composition
| Elements |
Content 1 |
| UO3 |
85.15 |
| H2O+ |
7.45 |
| K2O |
3.35 |
| CaO |
2.20 |
| SrO |
2.05 |
| BaO |
0.00 |
| Total |
100.20 |
- Optical Properties
- Optical class: Biaxial (-)
- Orientation: X = a; Z = b
- Dispersion: r < v or r > v, strong
- α = n.d; β = 2.01; γ = 2.06
- 2V(meas.) = 55°
- Estimated Properties
| Electron density |
Bulk density (electron density) = 4.77 g/cm3
note: Specific gravity of Agrinierite = 5.66 g/cm3 |
| Photoelectric |
PEAgrinierite = 1,925.80 barns/electron
U = PEAgrinierite x ρ electron density = 9,191.95 barns/cm3 |
| Fermion index |
Boson index = 0.9934 |
Radioactivity
|
Agrinierite is radioactive
|
How to Identify Agrinierite
Agrinierite can be identified in the field by its orange color. Its transparent to translucent form has good cleavage. This mineral is non-magnetic, and has a resinous-greasy luster.
The density of agrinierite is 5.62 to 5.7 g/cm3.
Global Distribution
Agrinierite is distributed mainly in France, at the Margnac mine in Compreignac, Haute-Vienne.
Occurrence of Agrinierite and Useful Mineral Association
Agrinierite occurs in the oxidation zone of a uranium deposit.
It is often associated with minerals such as uranophane and gummite.
References