Corsi Collection of Decorative Stones

view of stone 985

Corsi 985, approx. 145 x 73 x 40 mm, © Oxford University Museum of Natural History

OUMNH Number: 985  
Name and quarry location: Porfido di Siberia, from Siberia, Russia  
Geological description: Plagiophyric micro-diorite. Laths of white plagioclase, frequently in clusters, and dark green subhedral amphibole set in fine-grained matrix of probably similar mineralogy.  
Comments: This locality has not been confirmed and is very doubtful.  
Further information:

Corsi's classification: Class 15. Porphyry; Species 1.; ii. Italian porphyries  
Corsi's text: 196.11/ S26.3 Porfido di Siberia  

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