I call it out as having the possibility of containing asbestos. The reason it may contain asbestos is that the majority of vermiculate insulation in North America came from a mine in Montana and got comingled with asbestos. The following statement was copied and pasted. Vermiculite from the mine near Libby, Montana, is contaminated with tremolite asbestos and other amphibole fibers (winchite and richterite). Asbestos-contaminated Libby vermiculite was used in loose-fill attic insulation that remains in millions of homes in the United States, Canada, and other countries.
source https://www.inspectorsjournal.com/topic/12711-vermiculite-insulation/?do=findComment&comment=172767
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