A commercial trade designation used by some suppliers for selected Botticino material; its exact appearance and grading are supplier-dependent.
Botticino Extra is a commercial trade designation used by some stone suppliers for selected Botticino material. Unlike the protected designation Botticino Classico, the term Extra is not a single universal geological classification and its visual criteria may vary between suppliers.
When specifying or purchasing Botticino Extra, the actual quarry source, slab photographs, physical properties, and supplier grading criteria should therefore be confirmed.
Etymology
Botticino + commercial grading term extra, used to suggest a selected or premium grade.
Sculptor Notes
Treat 'Extra' as a trade grade, not as a precise geological term. Different suppliers may use the name for materially different selections. For sculpture or architectural specification, examine the actual block or slab.
References
https://www.brachot.com/en/materials/botiex/botticino-extra/ | https://www.imperomarmi.com/materiali/botticino-classico-extra