In this example from the Sevso Silver Collection, we took a very small sample of material encrusted on one of the vases and using PXRD identifed the minerals phases in the sample. The blue line represents the raw diffraction data as collected and the red lines are the 10 matched standards from the powder diffraction file (of the ICDD) overlaid and scaled to the raw data. Even then, only quartz and calcite are present in significant proportions, the other eight are minor components.