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Thorianite is a rare thorium oxide mineral, ThO2. It was originally described by Ananda Coomaraswamy in 1904 as uraninite, but recognized as a new species by Wyndham R. Dunstan. It was so named by Dunstan on account of its high percentage of thorium; it also contains the oxides of uranium, lanthanum, cerium, praseodymium and neodymium. Helium is present…
Occurrence, Overview & Chemistry
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thorium crystals mineral uraninite also black cm madagascar reported cerium tho2 usually alluvial radioactive sands present near dunstan high deposits
| Subject | Predicate | Object | Confidence | Src |
|---|---|---|---|---|
| Thorianite | Category | Oxide mineral | 1.00 | infobox |
| Thorianite | Cleavage | Poor/Indistinct | 1.00 | infobox |
| Thorianite | Color | Dark gray, brown-black | 1.00 | infobox |
| Thorianite | Crystal class | Hexoctahedral (m3m) H-M symbol: (4/m 3 2/m) | 1.00 | infobox |
| Thorianite | Crystal habit | Cubic crystals, usually rounded to some degree in detrital deposits | 1.00 | infobox |
| Thorianite | Crystal system | Isometric | 1.00 | infobox |
| Thorianite | Diaphaneity | Opaque, translucent on thin edges | 1.00 | infobox |
| Thorianite | Formula | Thorium oxide, ThO2 | 1.00 | infobox |
| Thorianite | Fracture | Irregular to uneven, sub-conchoidal | 1.00 | infobox |
| Thorianite | IMA symbol | Tho | 1.00 | infobox |
| Thorianite | Luster | Resinous, sub-metallic | 1.00 | infobox |
| Thorianite | Mohs scale hardness | 6.5 – 7 | 1.00 | infobox |
| Thorianite | Optical properties | Isotropic | 1.00 | infobox |
| Thorianite | Other characteristics | Radioactive | 1.00 | infobox |
| Thorianite | Refractive index | n = 2.20 – 2.35 | 1.00 | infobox |
| Thorianite | Space group | Fm3m | 1.00 | infobox |
| Thorianite | Specific gravity | 9.7 | 1.00 | infobox |
| Thorianite | Streak | Grey, grey green to black | 1.00 | infobox |
| Thorianite | Strunz classification | 4.DL.05 | 1.00 | infobox |
| Thorianite | Twinning | Penetration twins on {111} common | 1.00 | infobox |
| Thorianite | Unit cell | a = 5.595 Å; Z = 4 | 1.00 | infobox |
| Thorianite | is a | rare thorium oxide mineral | 0.90 | text |
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