Kratochvilite is a rare organic mineral formed by combustion deposits. It is a hydrocarbon with the formula of either C13H10 or (C6H4)2CH2. It is a polymorph of the aromatic hydrocarbon. It forms white, yellow to brown crystals in the orthorhombic which occur often as a druzey encrustation. It has a specific gravity of 1 to 2.
It was first described from the Nejedly mine in Bohemia , Czech Republic