Corsi Collection of Decorative Stones

view of stone 895

Corsi 895, approx. 145 x 73 x 40 mm, © Oxford University Museum of Natural History

OUMNH Number: 895  
Name and quarry location: Granito delle Alpi, from the Alps  
Geological description: Foliated metadiorite or metagabbro with a coarse, ferromagnesium-rich band traversed by shear lines rich in dark mafic minerals, containing megacrysts/augen of plagioclase.  
Comments: This is one of the stones (metadiorites or metagabbros) in Corsi's collection that would in the past have been called eufotide (euphotide). They are found in a number of locations in the Italian Alps, including Elba and Genoa. Nos. 872, 884 and 895 all resemble Pescetto coll. no.122 'granito a bianco e nero antico, eufotide' from Ancient Rome, in the Servizio Geologico d'Italia. Other very similar specimens in that collection are labelled 'Granito verde luculleo chiaro, eufotide' from Ancient Rome, and 'Granito verde bronzato della sedia di San Giovanni, Eufotide' from Giaggiola (Bologna).  
References: Price (2007) 196; Repetti (1833) v2:139, v3:387-389. Other examples: Perscetto coll. 122, 125 and 127, Servizio Geologico d'Italia, Rome.  
Further information:

Corsi's classification: Class 16. Granites; ii. Italian granites  
Corsi's text: 216.47 Granito delle Alpi  

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