

Even the stone materials, used for the mounting of the altars, are subject-mater to be studied within the field of this project.
The altars have been constructed upon a wide time span, from 1594 to 1843, and during the centuries have been subjected to various modifications, displacements and damage.
The stone materials mainly used for their realization are: Calacata, Bardiglio, Serravezza Breccia, Peach Flower Breccia, Portoro Breccia , Carrara Brocatello, Siena Yellow, Belgium Black, Onyx, Portoro, Old Red, French Red, Scagliola, Old Green, Prato Green.
The High Altar was made by Flaminio Del Turco in 1608. The altar has two marble statues on the gable, “Faith” and “Charity” which was the work of Fulvio Signorini (1608), and a Tabernacle made by Franceso, Giovanni, Giuseppe and Agostino Mazzuoli between 1677 and 1679. On the occasion of the restoration works by Vanvitelli (1747 – 1755), two marble puttos upon clouds of scagliola were put on the tympanum, while a scagliola canopy held by angels was put in the vault.

The project also considers the study of the floor of the Bichi Chapel where a large part of the original 15th-century covering in painted majolica tiles is still kept, made by Pietro and Niccolò di Lorenzo Mazzabuoni (1488)
Details of the stone materials used for the realization of the altars.