Corsi Collection of Decorative Stones

view of stone 863

Corsi 863, approx. 145 x 73 x 40 mm, © Oxford University Museum of Natural History

OUMNH Number: 863  
Name and quarry location: 'Granito di Perosa', from Perosa Argentina, Chisone valley, Turin, Piedmont, Italy  
Geological description: Arkosic grit formed by weathering of quartz and feldspar-rich igneous or metamorphic rocks. Brownish red, well bedded; with scattered larger clasts of carbonate rock.  
Comments: This is a siliceous sedimentary rock belonging with Corsi's 'pudinghi' rather than his 'graniti'. The locality may be correct, as there are beds of pleistocene lacustine sediments in the Chisone valley, but this is not the pietre di Perosa or granito di Perosa, a dioritic gneiss that was quarried for building and ornamental purposes since the 19th century.  
References: Regione Piemonte website (n.d.).  
Further information:

Corsi's classification: Class 16. Granites; ii. Italian granites  
Corsi's text: 210.15 Granito di Perosa in Piemonte  

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