Commercially significant deposits are known only from the Thuong Xuan District in Thanh Hoa Province, where the aquamarine (as well as topaz) have been mined from granitic pegmatites and associated ...

· Suitable for use in high margin applications including powder metallurgy, isostatically pressed refractory products, and high-grade expanded graphite products such as foils or sheets ...

· Suitable for use in high margin applications including powder metallurgy, isostatically pressed refractory products, and high-grade expanded graphite products such as foils or sheets ...