The Raman spectrum of hematite:: Possible indicator for a compositional or firing distinction among Terra sigiliata wares

The Raman spectrum of hematite (CX-Fe2O3) is here discussed as a distinctive feature for Terra Sigillata sample wares. The broadening of the Raman lines and the appearance and increasing of the disorder band at 660 cm(-1), while moving from the external slip to the inner body, are proposed as valuation parameters for the study of the mineralogical composition and firing process of pottery productions.