Na₂SO₄

This sample of thenardite is displayed in the Smithsonian Museum of Natural History. Thenardite is an sulfate mineral of sodium with the composition Na₂SO₄. This sample is about 8x8 cm and is from Soda Lake, San Luis Obispo County, California. Thenardite is named after Louis Jacques Thenard (1777-1857), Professor of Chemistry, University of Paris (France).