| Xiangjiangite | |
|---|---|
| General | |
| Category | Phosphate minerals |
| Formula (repeating unit) | (Fe, Al)(UO2)4(PO4)2(SO4)2(OH)·22(H2O) |
| IMA symbol | Xjg |
| Strunz classification | 8.EB.05 |
| Crystal system | Tetragonal Unknown space group |
| Unit cell | 1,142.31 |
| Identification | |
| Formula mass | 453.91 g/mol |
| Color | Yellow |
| Crystal habit | Microscopic crystals; Platy |
| Mohs scale hardness | 1–2 |
| Luster | Silky |
| Streak | Light yellow |
| Diaphaneity | Semitransparent |
| Specific gravity | 3.47 |
| Optical properties | Biaxial(−) |
| Refractive index | nα = 1.558 nβ = 1.576 nγ = 1.593 |
| Birefringence | 0.035 |
| Pleochroism | Weak |
| 2V angle | 87 |
| Dispersion | Weak |
| Other characteristics |  Radioactive |
| References | |
Xiangjiangite is a phosphate mineral discovered near and named for the Xiang Jiang River in China. It was approved by the IMA in 1978, and was named after its locality.
Properties
Xiangjiangite is a pleochroic mineral, which is an optical phenomenon, meaning that depending on the axis it is viewed on, it appears as it changes colors. On both the X and Y axis, it can be seen in a yellow color, while on the Z axis it appears to be weak yellow color. This mineral is very strongly radioactive, and has a 3,845,084.01 radioactivity measured in GRapi.
It mainly consists of uranium (49.67%) and oxygen (39.23%), but otherwise contains sulphur (3.35%), phosphorus (3.23%), hydrogen (2.37%), iron (1.46%) and aluminum (0.70%).
References
- Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
- Xiangjiangite mineral data from Webmineral
- Mindat.org
- Handbook of Mineralogy
- ^ "Xiangjiangite Mineral Data". webmineral.com. Retrieved 2022-03-09.
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