Corsi Collection of Decorative Stones

view of stone 728

Corsi 728, approx. 145 x 73 x 40 mm, © Oxford University Museum of Natural History

OUMNH Number: 728  
Name and quarry location: Agata, locality unknown  
Geological description: Chalcedony (cryptocrystalline quartz) with aligned pink jaspery inclusions showing a few relic fossils suggesting silicified limestone; and with scattered black dendrites and other small dark sulphide/oxide mineral inclusions. The stone has been sheared and fractured, the thin fractures filled with calcite.  
Comments: There is no agate banding in this stone.  
Further information:

Corsi's classification: Class 14. Quartz and its varieties; Species 5. Agate  
Corsi's text: 138.6 Agata  

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