Corsi Collection of Decorative Stones

view of stone 876

Corsi 876, approx. 145 x 73 x 40 mm, © Oxford University Museum of Natural History

OUMNH Number: 876  
Name and quarry location: probably granito nero, from between Aswan and Shellal District, Nile Valley, Egypt  
Geological description: Amphibole-rich granodiorite-tonalite with megacrysts of plagioclase, and accessory titanite. There is some alignment of megacrysts giving faint foliation.  
Comments: This is probably a Precambrian basement rock from one of the many localities between Aswan and Shellal District, Nile Valley, Egypt. It is most probably a variety of 'granito nero', an ancient granite which found its way among Corsi's 'modern' stones. This stone has also been seen in a private collection of ancient stones.  
References: Borghini (1997) 224; Corsi (1845) 210-211, 215-216; Harrell (2010a); Lazzarini (2002c) 229; Mielsch (1985) 67; Price (2007) 234  
Further information:

Corsi's classification: Class 16. Granites; ii. Italian granites  
Corsi's text: 214.28 Granito delle Alpi  

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