Corsi Collection of Decorative Stones

view of stone 789

Corsi 789, approx. 145 x 73 x 40 mm, © Oxford University Museum of Natural History

OUMNH Number: 789  
Name and quarry location: probably porfido Trentino, from the Alps, and probably from the area of Bolzano, Trentino-Alto Adige, Italy  
Geological description: Porphyritic rhyolite or dacite with phenocrysts of quartz, feldspar and biotite.  
Comments: Comparison with a number of specimens of porphyry in the Naturhistorisches Museum Wien indicates this is probably from the Permian Atesino-Cima d'Asta volcanic complex of the Bolzano area, and is a variety of the stone known as porfido Trentino.  
References: Andreolli (2003-4); Price (2007) 204  
Further information:

Corsi's classification: Class 15. Porphyry; Species 1; ii. Italian porphyries  
Corsi's text: 195.1 Porfido delle Alpi  

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