Fig. 3
SEM–EDS elemental maps of S, K, Al and Ca from sample D-C1628 showing the presence of K-alum as a major inorganic component and supporting the presence of the minor potassium calcium sulphate mineral syngenite
Fig. 3 | Heritage Science
SEM–EDS elemental maps of S, K, Al and Ca from sample D-C1628 showing the presence of K-alum as a major inorganic component and supporting the presence of the minor potassium calcium sulphate mineral syngenite
