Does Vermiculite Always Contain Asbestos?

Does Vermiculite Always Contain Asbestos? Not all vermiculite products contain asbestos, but some do. An EPA study showed some vermiculite products contain low levels of asbestos. Asbestos is found primarily in the unmixed vermiculite product although some was found in pre-mixed potting soils. How can you tell if vermiculite has asbestos? How can I tell