May 14 2014
Jinshajiangite is a monoclinic mineral. It was discovered in 1982 in the Jinshajiang River, Sichuan Province, China. It was named after its place of discovery.
Properties of Jinshajiangite
The following are the key properties of Jinshajiangite:
- Cell Data
- Space Group: C2 = m; Cm; or C2
- a = 10.732
- b = 13.847
- c = 20.817
- β = 95°3'
- Z = 2
- Crystal Data
- Monoclinic
- Point Group: 2/m, m, or 2
- As tabular crystals, up to 2cm
- X-ray Powder Pattern: 3.44 (10), 3.15 (8), 2.570 (8), 10.2 (7), 2.85 (7), 2.63 (7), 1.715 (5b)
- Chemical Composition
| Elements |
Content |
| SiO2 |
27.10 |
| FeO |
19.07 |
| TiO2 |
15.90 |
| MnO |
12.93 |
| BaO |
9.80 |
| Na2O |
3.15 |
| CaO |
2.94 |
| F |
2.66 |
| K2O |
2.31 |
| Fe2O3 |
1.64 |
| -O = F2 |
1.12 |
| Nb2O5 |
1.03 |
| (Zr;Hf)O2 |
0.70 |
| Al2O3 |
0.36 |
| H2O- |
0.36 |
| H2O+ |
0.33 |
| RE2O3 |
0.30 |
| MgO |
0.28 |
| SrO |
0.08 |
| Ta2O5 |
0.07 |
| Total |
99.89 |
- Optical Properties
- Optical Class: Biaxial (+)
- Pleochroism: Strong
- X = light golden yellow
- Y = brownish yellow
- Z = brownish red
- Orientation: X ^ c = 13°
- Dispersion: r < v
- Absorption: X = Y > Z
- α = 1.729
- β = 1.802
- γ = 1.852
- 2V(meas.) = 72°
- 2V(calc.) = 76°
- Estimated Properties
| Electron density |
Bulk density (electron density) = 3.44 g/cm3
note: Specific gravity of Jinshajiangite = 3.61 g/cm3 |
| Photoelectric |
PEJinshajiangite = 48.03 barns/electron
U = PEJinshajiangite x ρElectron density = 165.06 barns/cm3 |
| Fermion index |
Fermion index = 0.03
Boson index = 0.97 |
Radioactivity
|
Jinshajiangite is barely detectable
|
How to Identify Jinshajiangite
Jinshajiangite occurs in a wide range of colors, from black to black-red, yellow-red and brown-red. Its fractures are uneven, and it forms thin, flat crystals. It has perfect cleavage, vitreous luster and light yellow streak. The hardness of Jinshajiangite ranges from 4.5 to 5, and its density is 3.61 g/cm3.
Global Distribution
Jinshajiangite is mainly distributed near the Jinshajiang River, western Sichuan Province, China.
Occurrence of Jinshajiangite and Useful Mineral Association
Jinshajiangite occurs in an arfvedsonite dike in alkalic syenites.
Chevkinite, monazite, pyrochlore, aegirine, arfvedsonite, and albite are all closely associated with Jinshajiangite.
References