What is "kogarkoite"

n. (context mineralogy English) A pale blue monoclinic mineral with the chemical formula Na₃(SO₄)F.

Kogarkoite is a sodium sulfate fluoride mineral with formula Na(SO)F. It has a pale blue color. The specific gravity is about 2.67 and the hardness is 3.5. The crystal system is monoclinic. Kogarkoite is named after the Russian petrologist Lia Nikolaevna Kogarko (born 1936) who discovered the mineral.