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Vermiculite is a hydrated phyllosilicate mineral, usually found as small acicular crystals. It is used as a soil amendment to improve aeration and water retention.

Vermiculite is a clay mineral, with expansive properties under the effect of heat, but it will not swell, it will undergo an exfoliation, that is to say a separation in several layers. It will thus offer a light and airy texture. Vermiculite has a neutral to slightly basic pH.