Colemanite....16 Jun 2018 13:01
Colemanite has many important uses. It is a significant ore of boron, and was the most important ore prior to the discovery of Kernite in 1926. It is also used in the manufacture of heat resistant glass, and has other industrial, medicinal, and cosmetic uses. It is a popular collector mineral.
Chemical Formula: Ca2B6O11 · 5H2O
Crystal System: Monoclinic
Rock Type: Sedimentary
Composition: Hydrous calcium borate