Corsi Collection of Decorative Stones

view of stone 848

Corsi 848, approx. 145 x 73 x 40 mm, © Oxford University Museum of Natural History

OUMNH Number: 848  
Name and quarry location: Granito Misio, from Kozak Mountains (the ancient Pergamon), Izmir,Turkey; or granito antico, from Gebel Dokhan (Mons Claudianus)-Wadi Umm Huyut area, Eastern Desert, Egypt.  
Geological description: Tonalite gneiss with black hornblende. Distinct foliation evident on side of specimen.  
Comments: This stone has been recognised as granito misio, sometimes called marmor misium, which was quarried at Kozak, near Pergamon, Turkey. Euhedral crystals of hornblende are particularly characteristic. It has also been suggested that this might be from Egypt, a tonalite gneiss which is a hybrid of the varieties from Mons Claudianus and Wadi Umm Huyut. It is however atypical of both and intermediate between the two.  
References: Borghini (1997) 224; De Vecchi (2000); Harrell (2010a); Lazzarini (1998); Lazzarini (2002c) 229, 246-248; Price (2007) 228, 234  
Further information:

Corsi's classification: Class 16. Granites; i. Antique granite  
Corsi's text: 208.36 Granito antico. Marmor Syenite. Marmo Sienite... [trovata] presso la città di Siene sul confine fra Egitto, e l'Etiopia... Pyrrhopoecilon... Psaronion...Aethiopicum perchè... era Siene sul confine dell' Etiopia.  

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