Corsi Collection of Decorative Stones

view of stone 648

Corsi 648, approx. 145 x 73 x 40 mm, © Oxford University Museum of Natural History

OUMNH Number: 648  
Name and quarry location: Pietra dell'Etna, from Mt. Etna, Catania, Sicily, Italy  
Geological description: Ignimbrite. A poorly sorted breccia with clasts of rusty-coloured medium grained crystalline rock, discrete crystals of altered feldspar, and ferromagnesian minerals, all in a very fine-grained hematite-bearing groundmass. There is a faint preferred orientation of the clasts.  
Comments: No.652 is very similar ignimbrite, but a bit darker in colour.  
Further information:

Corsi's classification: Class 8. Volcanic stones; ii. Stones from Etna  
Corsi's text: 156.4 Pietra dell'Etna  

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