Corsi Collection of Decorative Stones

view of stone 791

Corsi 791, approx. 145 x 73 x 40 mm, © Oxford University Museum of Natural History

OUMNH Number: 791  
Name and quarry location: Porfido di Corsica, from Corsica, France  
Geological description: Altered amygdaloidal porphyritic olivine basalt. Pseudomorphed euhedral phenocrysts of olivine and subhedral pyroxene are set in a dark grey fine-grained groundmass of pyroxene, olivine and feldspar. Olivine pseudomorphs contain dark oxide and carbonate. Amygdales have infillings of carbonate and silicate minerals, and many have reaction zones against groundmass in which the latter is lighter-coloured and coarser-grained.  
Further information:

Corsi's classification: Class 15. Porphyry; Species 1; ii. Italian porphyries  
Corsi's text: 195.3 Porfido di Corsica  

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