Corsi Collection of Decorative Stones

view of stone 975

Corsi 975, approx. 145 x 73 x 40 mm, © Oxford University Museum of Natural History

side view of stone 975

side view of stone 975, approx. 145 x 73 x 40 mm, © Oxford University Museum of Natural History

OUMNH Number: 975  
Name and quarry location: most probably breccia Medici di Siena, from Siena, Tuscany, Italy  
Geological description: Fine-grained calcite marble breccia; a sheared and metamorphosed limestone breccia.  
Comments: This stone is calcareous and belongs with Corsi's breccias, not his jaspers. The texture and colouring supports those who have said it is from Siena, the breccia now called Medici di Siena. However, comparison with samples in the Naturhistorisches Museum Wien suggests it could be a variety of breccia violetta from Seravezza, Tuscany.  
References: Bartelletti (2003); Jervis (1862) 1-22; Lazzarini (1999a); Pieri (1954); Price (2007) 131; Watson (1916) 189-197  
Further information:

Corsi's classification: Class 14. Quartz and its varieties; Species 5. Agate  
Corsi's text: 185.21/ S24.1 Agata bionda antica  

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