Corsi Collection of Decorative Stones

view of stone 748

Corsi 748, approx. 145 x 73 x 40 mm, © Oxford University Museum of Natural History

OUMNH Number: 748  
Name and quarry location: Diaspro della Tolfa, from Monti della Tolfa, near Civitavecchia, Rome, Lazio, Italy (not confirmed)  
Geological description: Colourless fine-grained quartz with bands and scattered inclusions of pyrite. Brown areas are filler/polishing compound. Circular aggregates of quartz crystals visible on side of specimen resemble silicified coral.  
Comments: This is not a jasper.  
Further information:

Corsi's classification: Class 14. Quartz and its varieties; Species 6. Jasper; ii. Italian jaspers  
Corsi's text: 187.1 Diaspro della Tolfa presso Civitavecchia  

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