Figure 4: X-ray diffraction (XRD) spectra of a fine-grained sediment sample (till or glaciogenic clay and silt) collected on the Grenz Glacier, from a Jungfraujoch sample (JFJ) and from two Colle Gnifetti ice-core (CG) samples enriched in Saharan dust. The minerals and the Miller indices associated with the major peaks are indicated. P: paragonite, and Pk: palygorskite.