Corsi Collection of Decorative Stones

view of stone 738

Corsi 738, approx. 145 x 73 x 40 mm, © Oxford University Museum of Natural History

OUMNH Number: 738  
Name and quarry location: Sicilian jasper, diaspro-agata di Giancavallo, from Feudo Giancavallo, near Bisaquino, Palermo, Sicily, Italy  
Geological description: Brecciated jasper, clasts mainly yellow, in places altered grey-brown. Matrix of colourless crystalline quartz has some inclusions of iron sulphides on ghost faces. Agate is present as late stage infill within quartz matrix.  
Comments: This matches a sample from Feudo di Giancavallo, near Bisaquino, Province of Palermo, in the collection of the Naturhistorisches Museum Wien. Tata (1772) describes this locality: 'un Feudo di S. Maria del Bosco de' PP. Olivetani detto Giancavallo presso Giuliana.' and later as ''Feudo Giancavallo di S. Maria del Bosco'. For more information about jasper-agates from this locality see see Montana (1998).  
References: Jervis (1881) 193-318; Jervis (1889) 449-482; Montana & Briuccia (1998) 25, 32, 79; Price (2007) 246-247; Schmidt (2002); Tata (1772) 22, 29  
Further information:

Corsi's classification: Class 14. Quartz and its varieties; Species 5. Agate  
Corsi's text: 185.16 Agata di Giancavallo in Sicilia  

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