Vermiculite [13CXM8]
· Vermiculite Granules, exfoliated at temperatures of 1800°F to 1900°F (982 The expansion process is called exfoliation and it is routinely accomplished in purposedesigned commercial furnaces to describe the heat expansion of the vermiculite, which occurs at right angles to the strong basal cleavage When heated to a high temperature, flakes of vermiculite .