Na₆(SO₄)₂ClF

These samples of sulfohalite are displayed in the Smithsonian Museum of Natural History. Sulfohalite is a sulfate mineral which contains fluorine and chlorine. It has the composition Na₆(SO₄)₂ClF. This sample is about 3x3 cm long is from Kalahari Desert, Cape Province, South Africa.

The smaller sample has dimension about 0.8 cm.