Thorianite
ThO2IMA symbol: Thograndfathered
Thorianite is an oxide or hydroxide mineral with the formula ThO2, crystallizing in the cubic system. It has a Mohs hardness of 6-7, typically black in color, a specific gravity of 9.32.
Photos
Crystallography
| Crystal system | cubic crystal systemWikidata (CC0) |
|---|---|
| Space group | F m -3 m |
| Cell (Å, °) | a = 5.5997, b = 5.5997, c = 5.5997; α = 90, β = 90, γ = 90 |
| Cell volume | 175.588 ų, Z = 4 |
| Axial ratios | 1.0000:1:1.0000calculated from COD 9009046 |
| Source structure | COD 9009046 (Crystal Structures, 1963) |
Powder X-ray diffraction (calculated)
| d (Å) | 3.233 | 1.98 | 1.688 | 2.8 | 1.285 | 1.143 |
|---|---|---|---|---|---|---|
| I/I₀ | 100 | 50.3 | 47.9 | 36.9 | 19.7 | 16.9 |
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9009046; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 9.988 g/cm³calculated from COD 9009046 |
|---|---|
| Hardness (Mohs) | 6-7single sourceDana's System, 3rd Appendix (1915) |
| Specific gravity | 9.32 g/cm3single sourceDana's System, 2nd Appendix (1909) |
| Color | blacksingle sourceDana's System, 2nd Appendix (1909) |
Chemistry (calculated)
| Molecular weight | 264.04 g/molcalculated from the IMA formula |
|---|---|
| Composition (wt%) | Th 87.88%, O 12.12% |
Classification
| Nickel-Strunz (10th) | 4.DL.05Wikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 4.DL.05Wikidata (CC0) |
| Dana (8th) | 5.1.1.2Wikidata (CC0) |