Corsi 740, approx. 145 x 73 x 40 mm, © Oxford University Museum of Natural History
| OUMNH Number: | 740 |
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| Name and quarry location: | Calcedonio di Volterra, Diaspro di Monterufoli, from Monterufoli, near Pomarance, Pisa, Tuscany, Italy |
| Geological description: | Brecciated grey-white chalcedony, agate in part; many clasts have halos of yellow goethite banded with cream-coloured microcrystalline quartz, the latter present elsewhere as matrix. |
| Comments: | From Monterufoli, Pomarance, near Volterra. Jervis (1889) describes this stone and its use in pietre dure work. |
| References: | Jervis (1889) 320 |
| Further information: |
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| Corsi's classification: | Class 14. Quartz and its varieties; Species 5. Agate |
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| Corsi's text: | 185.18 Agata di Volterra. Achates |