Asbestos
Asbestos is a natural mineral substance obtained as a result of the decomposition of certain types of rocks. It has a very characteristic fibrous structure; sometimes appears silky, its color varies widely, usually being white, it can occasionally be gray, greenish, blue, or dark brown. Its main property is resistance to fire and acids.
Source: "Explanations to the Commodity Nomenclature of Foreign Economic Activity of the Russian Federation (HSN Russia)" (prepared by the Federal Customs Service of Russia) (Volume 1, Sections I - VI, Groups 1 - 29)