Corsi Collection of Decorative Stones

view of stone 641

Corsi 641, approx. 145 x 73 x 40 mm, © Oxford University Museum of Natural History

OUMNH Number: 641  
Name and quarry location: Pietra del Vesuvio, from Mt. Vesuvius, Naples, Campania, Italy  
Geological description: A porphyritic lava/dyke rock, probably a trachyandesite, showing a large cognate inclusion with a reaction rim. It has euhedral phenocrysts of pyroxene, feldspar and olivine. The fine-grained groundmass contains the same minerals set in devitrified glass or zeolite.  
Further information:

Corsi's classification: Class 8. Volcanic stones; i. Stones from Vesuvius  
Corsi's text: 155.21 Pietre del Vesuvio  

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