Corsi Collection of Decorative Stones

view of stone 765

Corsi 765, approx. 145 x 73 x 40 mm, © Oxford University Museum of Natural History

OUMNH Number: 765  
Name and quarry location: Sicilian jasper, diaspro di Castro Giovanni, from either Enna, Sicily, or more probably Monte di Castrogiovanni, near Bivona, Agrigento, Sicily, Italy  
Geological description: Silicified limestone/limestone conglomerate coloured black by included crystals of hematite. A large yellow goethitic pebble is prominent, and scattered mollusc shells are also evident. Matrix and fracture fills are chalcedony.  
Comments: This was perhaps from Enna, which was formerly called Castrogiovanni, a locality mentioned by various authors quoted in Montana (1998), although it is not a locality for jasper listed by Jervis (1881 & 1889) or by Tata (1772).  
References: Jervis (1881) 193-318; Jervis (1889) 449-482; Montana & Briuccia (1998) 33, 38; Price (2007) 246-247; Schmidt (2002); Tata (1772)  
Further information:

Corsi's classification: Class 14. Quartz and its varieties; Species 6. Jasper; ii. Italian jaspers  
Corsi's text: 189.18 Diaspro di Castro Giovanni... di Sicilia  

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