Ozocerite
Monte Falò, Savigno, Valsamoggia, Metropolitan City of Bologna, Emilia-Romagna, Italy
White masses of ozocerite, a naturally-occurring odoriferous mineral wax or paraffin.
Chemically, ozocerite consists of a mixture of various hydrocarbons near C^38H^78; it melts at 54°C and, when rubbed, it assumes a negative electric charge and gives off a bad smell of bitumen.
Image area is 4 mm x 4 mm
Photo and collection Luigi ...