Thin sections of Andesite

Slide 19 Porphyritic andesite, pp 15
In this rock the phenocrysts (some of them in clots) of plagioclase, hornblende (khaki in PPL), augite (pale green in PPL) and magnetite, are surrounded by fine-grained groundmass of plagioclase, magnetite and glass

Andesite from Siebengebirge, Germany; magnification x 23

andesite ppl image

PPL image of andesite

andesite xpl image

XPL image of andesite