Corsi Collection of Decorative Stones

view of stone 983

Corsi 983, approx. 145 x 73 x 40 mm, © Oxford University Museum of Natural History

OUMNH Number: 983  
Name and quarry location: Porfido delle Alpi, from the Alps  
Geological description: Quartz porphyry. Pale reddish brown rock. Subhedral phenocrysts of glassy quartz up to 3mm and pale brown alkali feldspar set in very fine-grained pale brown groundmass with occasional ferromagnesian silicate mineral and black oxide.  
Comments: This locality has not been confirmed.  
Further information:

Corsi's classification: Class 15. Porphyry; Species 1.; ii. Italian porphyries  
Corsi's text: 196.9/ S26.1 Porfido delle Alpi  

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