Portal:Minerals/Did you know/6

... that the mineral shigaite (hexagonal crystal pictured) is named for the Japanese Prefecture where it was discovered in 1985?
... that naturally-occurring quasicrystals can be found in the rare minerals khatyrkite and cupalite?
... that the existence of the mineral frankdicksonite was predicted before its discovery?
... that seifertite, one of the densest polymorphs of silica, is named after Friedrich Seifert and has only been found in meteorites?