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
Tremolite
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Tremolite is a member of the amphibole group of silicate minerals with composition Ca2Si8O222. Tremolite forms by metamorphism of sediments rich in dolomite and quartz, and occurs in two distinct form
Vermiculite
…are now regularly tested for it and are supposed to sell products that contain no asbestos. The former vermiculite mine in Libby, Montana, did have tremolite asbestos as well as winchite and richterite (both fibrous amphiboles)—in fact, it was formed underground through essentially the same geologic processes…
Tremolite Campolungo
Tremolite from the Aure Valley, French Pyrenees (size: 8.2 × 6.7 cm)
Crystalline tremolite