i am selling 8 tons of coltan with the following specifications nb 19. 86, tantalum 11. 99;zirconium 0. 08, iron 15. 5, magnesium 1. 2 i am selling 8 tons of coltan with the following specificationsnb 19. 86tantalum 11. 99zirconium 0. 08iron 15. 5mag
