1) Silicate mineral 
Chibaite is a rare silicate mineral. It is a silica clathrate with formula SiO2·n(CH4,C2H6,C3H8,i-C4H10) (n = 3/17 (max)). The mineral is cubic (isometric diploidal) and the silica hosts or traps various hydrocarbon molecules. Chibaite was first described for specimens collected from Arakawa, Chiba Prefecture, Honshu Island, Japan. The mineral wa...