English: White crystals of the rare silica-hydrocarbon minerals chibaite (IMA 2008-067) and bosoite (IMA 2014-023) from the type and only known locality worldwide for both species: Arakawa, Minamiboso City, Chiba Prefecture, Honshu Island, Japan. Chibaite and bosoite can't be visually differentiated. Natural analogues of synthetic clathrate MTN with hydrocarbon molecules such as methane, ethane, propane, and 2-methyl-propane contained in its cage-like voids. Chibaite and bosoite are also described as a clathrasils. Ex Alfredo Petrov specimen.
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