出典:Wiktionary
From Latin vermiculus (“wormlet”), for its fibrous nature and tendency to expand into worm-like shapes when heated.
vermiculite (countable かつ uncountable, 複数形 vermiculites)
出典:Wikipedia
出典:『Wikipedia』 (2011/06/29 02:39 UTC 版)
Vermiculite is a natural mineral that expands with the application of heat. The expansion process is called exfoliation and it is routinely accomplished in purpose-designed commercial furnaces. Vermiculite is formed by weathering or hydrothermal alteration of biotite or phlogopite. Large commercial vermiculite mines currently exist in Russia, South Africa, China, and Brazil.