. Atti della Società toscana di scienze naturali, residente in Pisa. Natural history; Science; Science. LE ROCCE PORFIEICHE DELL ISOLA D ELBA 81 definiti, le facce piti o meno scabre. Tali cristalli, veduti in sezione, si presentano arrotondati o granulari. {Fig. 1).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Società toscana di scienze naturali. [S. l. : s. n. ]

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