Amphibolite
Even the hardest and most resistant rocks undergo surface alteration. Amphibolite, composed of iron and magnesium rich minerals, is no exception. The most altered parts often show special colors caused by oxidation of these chemical elements.
Amphibolites are common in the Central-Western Alps, the Ligurian Apennines, Sardinia, Calabria, and the Peloritani Mountains in Sicily.
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