Pyrrhotite from Al-Qassim Region, Saudi Arabia
Saudi Arabia | |
| (1998) International strategic mineral issues summary report: tungsten. Circular 930-O. US Geological Survey doi:10.3133/cir930o |
| Mining Annual Review (1985): 475. |
Saudi Arabia | |
| (1998) International strategic mineral issues summary report: tungsten. Circular 930-O. US Geological Survey doi:10.3133/cir930o |
| Mining Annual Review (1985): 475. |