Vermiterra is a hydrous phyllosilicate mineral. It belongs to the clay group, and specifically to the crystalline clays with a lamellar structure. Its look resembles to mica. Vermiculite’s main characteristic is the trapped water it contains between its layers of leaves. This layer of water vaporizes abruptly at a temperature of 900°C, resulting in an increase of the mineral by up to 30 times versus its original volume. The exfoliation converts the ore's fine flakes into lightweight accordion-shape granule particles containing numerous layers of air.
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