Corsi Collection of Decorative Stones

view of stone 750

Corsi 750, approx. 145 x 73 x 40 mm, © Oxford University Museum of Natural History

OUMNH Number: 750  
Name and quarry location: Opal, resinite della Tolfa, from Monti della Tolfa, near Civitavecchia, Rome, Lazio, Italy  
Geological description: Massive resinite, a variety of opal; ferruginous coloration.  
Comments: Resinite is a variety of opal. Jervis (1881) does not record Tolfa as a provenance of resinite or any other variety of opal. This is the only sample in Corsi's collection that is protected by a very thin sheet of glass glued to the top surface. The specimen is clearly very fragile and has been broken into many pieces and glued back together.  
References: Jervis (1881) 377  
Further information:

Corsi's classification: Class 14. Quartz and its varieties; Species 6. Jasper; ii. Italian jaspers  
Corsi's text: 187.3 Resinite della Tolfa  

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