Tags: Chemical Substance, Mineral.
Bararite is a natural form of ammonium fluorosilicate (also known as hexafluorosilicate or fluosilicate). It has chemical formula (NH4)2SiF6 and trigonal crystal structure. This mineral was once classified as part of cryptohalite. Bararite is named after the place where it was first described Barari India. It is found at the fumaroles of volcanoes (Vesuvius Italy) over burning coal seams (Barari India) and in burning piles of anthracite (Pennsylvania U.S.).