KNa₂BSi₁₂O₃₀

This sample of poudrettite is displayed in the Smithsonian Museum of Natural History. Poudrettite is a silicate mineral that contains boron as well as potassium and sodium It has the composition KNa₂BSi₁₂O₃₀. The gem sample at left is 9.41 carats and is from Burma.

The spelling poudretteite is also used, and is used by Mindat. This is a rare mineral.