Chemical Properties
| Appearance | Black, brown, yellow to colorless; streak white, luster submetallic to vitreous to greasy. Highly resistant to chemicals. |
| Melting point | 2710℃ [KIR84] |
| Boiling point | 4300℃ [MER06] |
| density | 5.85 [MER06] |
| Water Solubility | insoluble H2O; slightly soluble HCl, HNO3; soluble in heated mixture of 2 part H2SO4, 1 part H2O [MER06] |
| Uses | |
| CAS DataBase Reference | 12036-23-6 |