Corsi Collection of Decorative Stones

view of stone 730

Corsi 730, approx. 145 x 73 x 40 mm, © Oxford University Museum of Natural History

side view of stone 730

side view of stone 730, approx. 145 x 73 x 40 mm, © Oxford University Museum of Natural History

OUMNH Number: 730  
Name and quarry location: Agata del San Stefano, from Santo Stefano Quisquina, Agrigento Sicily, Italy; or more probably quarzo di Monterufoli, from Monterufoli, near Pomarance, Pisa, Tuscany, Italy  
Geological description: Brecciated agate, colourless crystalline quartz cement with spherular limonitic inclusions. Agate-lined quartz-filled fractures.  
Comments: Agates and jaspers do come from Santo Stefano Quisquina, Province of Agrigento, Sicily, Italy, according to Jervis (1881), but Corsi's specimen matches very closely sample 526 in the Pescetto Collection of the Servizio Geologico d'Italia described as from 'Monte Rufoli (Volterra)?' (Corpo reale delle Miniere, 1904). It is more brecciated than Corsi 742 'breccia di Siena' which is clearly from the same locality.  
References: Corpo reale delle Miniere (1904) 74; Jervis (1881) 226. Other examples: Pescetto no. 526.  
Further information:

Corsi's classification: Class 14. Quartz and its varieties; Species 5. Agate  
Corsi's text: 184.8 Agata di S.Stefano in Sicilia  

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