Do all vermiculite contain asbestos

No, not all vermiculite contains asbestos. While some vermiculite deposits, particularly those from Libby, Montana, were found to be contaminated with asbestos, many other sources of vermiculite are asbestos-free. It's important to test vermiculite products to determine their safety, especially if they were sourced from areas known for asbestos contamination. Always consult professionals for assessment and remediation if asbestos presence is suspected.