Alabastro listato or fiorito of Hierapolis in Phrygia was a prestigious coloured marble widely used in Roman architecture and decoration. This stone is generally identified in artefacts on autoptic examination, but it may sometimes be confused with alabasters of different provenances. This study describes a simple, but effective, scientific method to contribute to the determination of Hierapolis alabaster. Due to its unique genetic context, it is characterized by a distinctive carbon isotope signature. A comparison between the stable carbon isotope data from this paper and from the literature confirms the uniqueness of the isotopic character of Hierapolis alabaster. Carbon isotopes can ensure a reliably provenance attribution of the alabaster artefacts along with visual recognition by an expert eye. sanctuary for the gods of the Underworld, was built on a hot bubbling spring. The temperature of the water is close to 35°C, and its emergence to the surface, after a long, deep subterranean circulation, is favoured by crustal tectonic discontinuities that act as preferential ascent routes (Dilsiz 2006;Kele et al. 2011).Hot waters also characterized many springs in the Denizli Basin in the past, most of which bordered the north-eastern flank of the valley. This evidence is provided by the late Quaternary travertine deposits that formed at different times over the last 400 kyr and scattered along the borders of the Denizli Basin, punctuating tectonic lineaments (De Filippis et al. 2012).The travertine outcrops in the Denizli Basin can be classed into five morphological types according to Altunel and Hancock (1993a,b): terraced-mound travertine, range-front travertine, fissure-ridge travertine, eroded-sheet travertine and self-built channel travertine. The area's most characteristic landform is the fissure ridge, a term that dates back to 1883, when Hayden used it to describe an elongated mound with a central fissure along its long axis, characterizing the travertine deposition from hydrothermal hot waters rising along fractures in the bedrock. They are characterized by two main structure types that show different dispositions. The first structure is 'bedded', which has the typical aspect of porous, encrusted travertine and is located on the flanks of the ridge. The second structure, called 'banded', is deposited in the fissures and veins, with a massive aspect, coloured to form brown, yellow and white patchy patterns, sometimes translucent and similar to the cave speleothems. Both types were quarried in ancient and modern times, but the latter was greatly appreciated for its colours and aspect in classical times. Its popularity led it to be exported to Rome and used as prestigious coloured marble in Roman architecture and decoration. It was classified by the Roman stonemasons as alabaster and was later dubbed Alabastro fiorito or listato, probably due to 19th-century literature (Corsi 1845).Bruno (2002) reported the possibility that Strabo recorded the arrival of this stone in Rome, along with different coloured stones...