Arizona Photos Oxidation, Sunset Crater Volcano Previous Photo : Photo Index : Next Photo Sunset Crater Volcano is another of my most favourite places. The volcano has a stereotypical shape with a crater at its peak, but it is unique in the area in having a coloured top. Iron rich cinders not buried deep in ash have oxidised to give a red colour. In the afternoon light this colouration is most evident and illustrates how the volcano got its name. If you would like to use a photo, please write and ask. I almost always agree. Mail Form Here!