Corsi Collection of Decorative Stones

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view of stone 790

Corsi 790, approx. 145 x 73 x 40 mm, © Oxford University Museum of Natural History

OUMNH Number: 790  
Name and quarry location: Porfido Trentino, porfido Atesino, from Bolzano area, Trentino-Alto Adige, Italy  
Geological description: Pophyritic rhyolite with phenocrysts of quartz, feldspar and biotite.  
Comments: This porphyry, an ignimbrite deposit from the Permian Atesino-Cima d'Asta volcanic complex, is also known as porfido Atesino. It is one of a number of porphyries still quarried in the area around Bolzano, and all 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: 195.2 Porfido delle Alpi  

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