Vermiculite
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Vermiculite is a hydrous phyllosilicate mineral which undergoes significant expansion when heated. Exfoliation occurs when the mineral is heated sufficiently; commercial furnaces can routinely produce
Vermiculite USGOV
Vermiculite from Paakkila, Tuusniemi, Eastern Finland
Anthophyllite, vermiculite
Perlite
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Perlite is an amorphous volcanic glass that has a relatively high water content, typically formed by the hydration of obsidian. It occurs naturally and has the unusual property of greatly expanding wh
Vermiculite
…variety of industries, some have more varied end products, with less stringent technical requirements. Some vermiculite exfoliators blend with lower-cost perlite also. Vermiculite exfoliators have an international trade association called The Vermiculite Association to represent the industry's interests and to…
Expanded horticultural perlite
Perlite boulders with fireweed in foreground
Perlite mine in Owens Valley, California.
Perlite mixed into potting compost