Corsi Collection of Decorative Stones

view of stone 754

Corsi 754, approx. 145 x 73 x 40 mm, © Oxford University Museum of Natural History

OUMNH Number: 754  
Name and quarry location: Calcedonio di Volterra, Diaspro di Monterufoli, from Monterufoli, near Pomarance, Pisa, Tuscany, Italy  
Geological description: Off-white chert clasts in a partially silicified, partly calcite or more probably dolomite matrix.  
Comments: Calcedonio di Volterra from Monterufoli, Pomerance, near Volterra. This stone is not technically a jasper, as it lacks the ferruginous colouration which incidentally is shown by other specimens in Corsi's collection from this locality such as 759. It is one of the stones employed by the pietre dure workshops of Florence.  
Further information:

Corsi's classification: Class 14. Quartz and its varieties; Species 6. Jasper; ii. Italian jaspers  
Corsi's text: 187.7 Diaspro di Volterra  

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