Tremolite asbestos constituted a contaminant of many if not all naturally occurring chrysotile deposits. Chrysotile (commonly known as white asbestos) is the only asbestos mineral in the serpentine group. The combination of oxalic acid with ultrasound fully degrades chrysotile asbestos fibers. Some World War II gas masks contained chrysotile asbestos or crocidolite asbestos in their filters. Garlock is a large manufacturer of gaskets that contain chrysotile asbestos. Globally it is a significant producer of lithium, chrysotile asbestos and vermiculite. Both were associated with the mining and processing of chrysotile asbestos. In Vietnam, chrysotile asbestos is not banned and still widely used. Chrysotile (asbestos) is still mined and used extensively in China as a construction material. Due to its efficacy, chrysotile asbestos was often a component in brake linings. One mineral in the serpentine group, chrysotile, is a type of asbestos. Russian demantoid often contain inclusions of chrysotile, which is a type of asbestos. In 2002 the import of chrysotile (white) asbestos was also banned. In 2002, the import of chrysotile (white) asbestos was banned. Chrysotile asbestos was utilized to make the fake snow used in this scene.