Selenizza is a naturally occurring solid hydrocarbon bitumen found in the native asphalt deposit of <answer>Selenice, in Albania</answer>, the only European asphalt mine still in use. The rock asphalt is found in the form of veins, filling cracks in a more or less horizontal direction. The bitumen content varies from 83% to 92% (soluble in carbon disulphide), with a penetration value near to zero and a softening point (ring & ball) around 120 °C. The insoluble matter, consisting mainly of silica ore, ranges from 8% to 17%.
To what location is Selenizza bitumen native?
Selenice, in Albania