The marble of O Incio (Galicia, Spain): Quarries and first archaeometric characterisation of a material used since roman times

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Abstract
In spite of the great leap forward experienced in our understanding of the use of marble and other ornamental stones in Roman Spain, provenance studies are still quite uncommon in some territories of the Iberian Peninsula. This was the case of the northwesternmost part (modern Galicia), where no significant work had been done until now. Within the framework of an interdisciplinary study, a significant number of objects studied did not match with the main well-known Classical marbles but seemed to have been produced with a local stone known as O Incio marble, which had never been yet archaeometrically analysed. Therefore, the quarries near the small village of O Incio were located and sampled, and a multi-method approach combining polarized-light microscopy, cathodoluminescence, X-ray powder diffraction and stable C and O isotope analysis as well as spectrophotometry was applied to characterize the different outcropping marble varieties as the first and basic step to correctly differentiate them from other Iberian and foreign marbles with similar macroscopic features.

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