Porfido del'Elba, from the island of Elba, Livorno, Tuscany, Italy
Geological description:
Porphyritic andesite or trachyandesite. Subhedral phenocrysts of plagioclase and pyroxene in fine-grained reddish-brown groundmass, possibly devitrified glass. Curved alignment of crystals indicates viscous flow.
Comments:
This locality has not been confirmed, but may be correct.
References:
Further information:
Corsi's classification:
Class 15. Porphyry; Species 1; ii. Italian porphyries