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ammonium silicofluoride
Ammonium fluorosilicate (also known as ammonium hexafluorosilicate, ammonium fluosilicate or ammonium silicofluoride) has the formula (NH4)2SiF6. It is a toxic chemical, like all salts of fluorosilicic acid.(2) It is made of white crystals,(3) which have at least three polymorphs(4) and appears in nature as rare minerals cryptohalite or bararite.