Corsi Collection of Decorative Stones

view of stone 823

Corsi 823, approx. 145 x 73 x 40 mm, © Oxford University Museum of Natural History

OUMNH Number: 823  
Name and quarry location: Granito antico, granito della Colonna, from Wadi Umm Shegilat, near Gebel Abu el-Hasan, Eastern Desert, Egypt  
Geological description: Coarse pegmatitic diorite, with large black prismatic crystals of hornblende.  
Comments: This distinctive very coarse-grained igneous rock is named after a small column in the chapel of Sant Zenone in the church of Santa Prassede in Rome, said to be that which Christ was chained to during his flagellation in Jerusalem. The stone is from the Precambrian basement rocks at Wadi Umm Shegilat. It is unusual in being sawn from the quarry in ancient Roman times rather than extracted with wedges.  
References: Borghini (1997) 220; Del Bufalo (2002); Harrell (2002c); Harrell (2010a); Lazzarini (2002c) 229-230; Mielsch (1985) 69, taf.23; Price (2007) 230  
Further information:

Corsi's classification: Class 16. Granites; i. Antique granite  
Corsi's text: 205.11 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.  

Full entry in English

Enter some search terms
Show results as:

search tips

Searches the database for all stone records containing the words you enter. To search for a text string, put it between quotation marks. To search for stone records that don't contain a word, put a minus sign in front of it.

For example, entering: granite "coarse-grained" -Egypt will find all the coarse-grained granites that do not come from Egypt.

Terms of three characters or less have not been indexed.