The Santa Barbara Cave is a dissolution cavity above the San Giovanni lead-zinc mine, first covered by large baryte crystals when still under water, while stalactites and stalagmites of aragonite formed after the cave became situated above the groundwater table.
Sardinia is the second-largest island in the Mediterranean Sea (after Sicily). The area of Sardinia is 24,090 square kilometres (9,301 sq mi). The island is surrounded (clockwise from north) by the French island of Corsica, the Italian Peninsula, Tunisia and the Balearic Islands. Sardinia is a constitutional part of Italy, with a special statute of regional autonomy under the Italian Constitution. http://en.wikipedia.org/wiki/Sardinia