Corsi Collection of Decorative Stones

view of stone 33

Corsi 33, approx. 145 x 73 x 40 mm, © Oxford University Museum of Natural History

OUMNH Number: 33  
Name and quarry location: Giallo antico, from Chemtou, Tunisia  
Geological description: Breccia of clasts of fine-grained limestone, extensively recrystallised through diagenesis, in a ferruginous micritic matrix. Note areas of coarser crystalline calcite (probably the relics of fossils), and minor dendrites of manganese oxides.  
Comments: All Corsi's samples of giallo antico from Chemtou, Tunisia (0022-0034) are correctly identified, and they show 'quarry variation' particularly well. Giallo antico is regarded as the finest of all the yellow marbles, although the very best Siena marble can be comparable. The matrix in giallo antico is red or brown; that of brecciated varieites of Siena is purple.  
References: Blagrove (1888) 83; Borghini (1997) 214-215; Corsi (1845) 90-91; Lazzarini (2002c) 243-244; Mielsch (1985) 56, taf.15; Price (2007) 90-91; Watson (1916) 271-274  
Further information:

Corsi's classification: Class 1. Marbles; Section 1. Monochrome marbles; Species 3. Yellow marbles, i.  
Corsi's text: 30.12 Giallo antico. Marmor Numidicum. Dalla Numidia oggi Coste di Barbaria provincia dell'Africa, e precisamente alle falde del monte Maurisado... Giallo cupo  

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