Chibaite
Chibaite is a rare silicate mineral. It is a silica clathrate with formula . The mineral is Cubic [crystal system|cubic] and the silica hosts or traps various hydrocarbon molecules, such as methane, ethane, propane and isobutane.
Chibaite was first described for specimens collected from Arakawa, Minamibōsō, Chiba Prefecture, Honshu Island, Japan. The mineral was approved by the International [Mineralogical Association|IMA] in 2009.