Mellite is actually an ORGANIC COMPOUND, a bizarre species indeed. It is an Aluminum mellitate (benzene hexacarboxylate) hydrate, a rare secondary mineral in lignite deposits. Specimens in this size and of this quality are seldom seen and I think exclusively come from this small mine. My understanding (though I have no proof of this) is that most were mined prior to WWII and few have been found since. This is a wonderful small cabinet sized specimen in every case, with numerous gemmy crystals. Superb!!!