May 12 2014
Anduoite was named after the original mineral location in Anduo, China.
Properties of Anduoite
The following are the key properties of anduoite:
- Cell Data
- Space group: Pnnm or Pnn2
- a = 5.41
- b = 6.206
- c = 3.01
- Z = 2
- Crystal Data
- Orthorhombic
- Point group: 2/m2/m2/m or mm2
- As euhedral to anhedral grains, to 100µm
- Granular aggregates
- X-ray powder pattern: 1.920 (100), 1.501 (90), 1.095 (90), 1.133 (80), 1.210 (70), 1.187 (70), 2.000 (50)
- Chemical Composition
| Elements |
Content 1 |
Content 2 |
Content 3 |
| As |
56.65 |
56.57 |
56.91 |
| Ru |
34.47 |
30.35 |
30.65 |
| Os |
6.20 |
7.27 |
8.37 |
| Ir |
2.08 |
1.86 |
0.54 |
| Rh |
0.00 |
1.02 |
1.54 |
| Pt |
0.00 |
0.82 |
0.65 |
| Pd |
0.00 |
0.52 |
0.61 |
| Ni |
0.00 |
0.00 |
0.95 |
| S |
0.09 |
0.26 |
0.12 |
| Cu |
0.10 |
0.00 |
0.00 |
| Sb |
0.01 |
0.00 |
0.00 |
| Total |
99.60 |
98.67 |
100.34 |
- Optical Properties
- Anisotropism: Noticeable in air, from brownish-yellow to grayish-green, pale red to pale green; distinct in oil, from reddish-yellow, greenish-yellow to purplish-gray
- Pleochroism: Noticeable in air, from pinkish-grayish white, to pinkish-white; distinct in oil
- Estimated Properties
| Electron density |
Bulk density (electron density) = 7.76 g/cm3
note: Specific gravity of anduoite = 8.98 g/cm3 |
| Photoelectric |
PEAnduoite = 336.17 barns/electron
U=PEAnduoite x ρ electron density= 2,607.79 barns/cm3 |
| Fermion index |
Fermion index = 0.11
Boson index = 0.89 |
Radioactivity
|
Anduoite is not radioactive
|
How to Identify Anduoite
Anduoite can be identified in the field by its lead gray color. Its opaque form has no cleavage. This mineral has a metallic luster, with grayish black streak. The fracture on this mineral is malleable. The hardness of anduoite is 7 – approximate to quartz.
Global Distribution
Anduoite is distributed in the following places:
- China - From the Anduo chromite deposit, northern Tibet
- Albania - From the Maja e Sukes chromite deposit, Tropoja massif
- Ukraine - At the Kapitanov chromite deposit, near Zvenyhorodka
Occurrence of Anduoite and Useful Mineral Association
Anduoite occurs in a magmatic origin, as very rare inclusions in chromian spinel, in chromitite bodies enclosed by augite peridotite, harzburgite, serpentinized dunite, and pyroxenite.
It is often associated with minerals such as chromian spinel, pyrite, pyrrhotite, magnetite, chalcopyrite, marcasite, millerite, molybdenite, galena, and violarite.
Other platinum group minerals that are present include sperrylite, ruthenian iridarsenite, irarsenite, irarsite, ruthenarsenite, osarsite, osmiridium, laurite, rutheniridosmine, chromian spinel, sperrylite, and hollingworthite.
References