Na₄(AlBeSi₄O₁₂)Cl

This sample of tugtupite is displayed in the Smithsonian Museum of Natural History. Tugtupite is a silicate mineral of beryllium and sodium which also contains chlorine. It has the composition Na₄(AlBeSi₄O₁₂)Cl. This sample is about 11x11 cm and is from Ilimaussaq, Kvanefjeld, Greenland. Tugtupite is typically red, but white also occurs.