Ignimbritic tuff, Sanidine, Quartz, Plagioclase, Annite-Phlogopite Series
Monte San Giorgio, Riva San Vitale, Lugano, Ticino, Switzerland
Glassy welded ignimbritic tuff from the Monte San Giorgio area. The glassy groundmass contains fragments of quartz, alkali feldspar, plagioclase, and biotite. Thin section, transmitted plane polarized light digital image, with crossed polarizers, width 2 mm.
G. Grundmann collection and photo.
Please compare the corresponding photomicrographs.
© Günter Grundmann, Detmold.