Source for porphyry sought

From: Olaf Pung <*olaf_pung<-a*> Date: Tuesday, May 17, 2005 · olaf_pung<-a

Vanessa Simeoni <vanessa.simeoni [at] westminster-abbey__org> writes

>Conservation and restoration work to one of the Cosmatesque
>Pavements here at Westminster Abbey has led us to attempt sourcing
>two of the ancient stones that make up this Pavement. At present we
>are finding it difficult to obtain both green Porphyry (from Sparta)
>and Purple/Imperial Porphyry (from Egypt) from reputable sources. ...

I have seen several blocks of porphyry in the courtyard of Oppificio
delle Pietre Dure, Firenze. I am not sure if they sell it, but maybe
they know another source.

Olaf Pung, stone conservator

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                  Conservation DistList Instance 18:54
                   Distributed: Friday, May 20, 2005
                       Message Id: cdl-18-54-004
                                  ***