41 samples from the quarries of Mount Pentelikon (Attica, Greece) and Proconnesos (Marmara Island, Turkey) were analyzed for accessory minerals using an electron microprobe, stable isotope 13C and 18O, and maximum grain size to investigate the dissimilarities between the quarry regions. The multivariate data were statistically analyzed using nonmetric multidimensional scaling, a dimensionality-reducing ordination method that was previously used almost exclusively for psychological and ecological data. Results from the nonmetric multidimensional scaling analyses showed dissimilarities between Pentelic and Proconnesian marble based primarily on stable isotope 13C and 18O and maximum grain size, and separation to a slightly lesser degree based on accessory mineral content.