Basalto
Roccia vulcanica povera di silice ma ricca di ferro, magnesio e calcio. E’ molto pesante, dura e tenace; di colore scuro (verde scuro, bruno rossastro, nero). In genere è impiegata come materiale per pavimentazioni.
Roccia vulcanica povera di silice ma ricca di ferro, magnesio e calcio. E’ molto pesante, dura e tenace; di colore scuro (verde scuro, bruno rossastro, nero). In genere è impiegata come materiale per pavimentazioni.
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