Ulexite.
Calcined colemanite mineral.
Minerals, amethyst.
Tantalite.
The mineral is treated at our own plant, near La Paz/Bolivia. You will be agree with appearance and size. The quality we guarantee never will be under 45% B 2O3-content, normally it leaves the oven with 48%. The minimum order should not be less than 40mt per month.
