Corsi Collection of Decorative Stones

view of stone 736

Corsi 736, approx. 145 x 73 x 40 mm, © Oxford University Museum of Natural History

OUMNH Number: 736  
Name and quarry location: Calcedonio di Volterra, Diaspro di Monterufoli, from Monterufoli, near Pomarance, Pisa, Tuscany, Italy  
Geological description: Brecciated jasper; relatively unfractured large yellowish clasts, many with halos of yellow goethite banded with cream-coloured microcrystalline quartz. Matrix further away from clasts is colourless-milky agate.  
Comments: Not from Dirillo River or any other locality in Sicily. This is 'calcedonio di Volterra' from Monterufoli, Pomarance, Province of Pisa, Italy; cf no. 740. The subtle variation in colour tone made this stone particularly suitable for portraying petals, shells etc, in Florentine pietre dure work.  
References: Brizzi (1988); Jervis (1889) 320; Marrucci (1991); Price (2007) 245  
Further information:

Corsi's classification: Class 14. Quartz and its varieties; Species 5. Agate  
Corsi's text: 184.14 Agata del fiume Drillo in Sicilia  

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