KNa₂₂(SO₄)₉(CO₃)₂Cl

This sample of hanksite is displayed in the Smithsonian Museum of Natural History. Hanksite is a has the composition KNa₂₂(SO₄)₉(CO₃)₂Cl. The sample at left is about 20 cm across and is from Searles Lake, San Bernadino County, California.