Corsi Collection of Decorative Stones

view of stone 725

Corsi 725, approx. 145 x 73 x 40 mm, © Oxford University Museum of Natural History

OUMNH Number: 725  
Name and quarry location: Moss agate, agata di Sardegna, from Sardinia, Italy  
Geological description: White chalcedony (cryptocrystalline quartz) with subtle agate banding, and extensive dendritic iron/manganese oxides.  
Comments: Sardinia, Italy, may be correct provenance. Jervis (1881; 137) records a chalcedony with dendritic pyrolusite from Alghero, Province of Sassari. Corsi's specimen is a an irregular shape piece to which other slices and infillings of white plaster have been added to give the required external shape. It is partly hollow.  
References: Corsi (1845) 239; Jervis (1881) 137; Price (2007) 242  
Further information:

Corsi's classification: Class 14. Quartz and its varieties; Species 5. Agate  
Corsi's text: 138.3 Agata di Sardegna  

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