Monzonite, Orthoclase, Anorthite (Var: Labradorite), Hornblende Root Name Group
Monzonite quarries, Plauenscher Grund, Dresden, Saxony, Germany
This rock illustrated consists mainly of alkali feldspar, plagioclase feldspar, amphibole (olive green), and biotite (dark olive green). The plagioclase shows multiple twinning and zoning, whereas the alkali feldspar shows no multiple twinning. Transmitted plane polarized light digital image, width of image 8 mm.
G. Grundmann collection and ...
© Günter Grundmann, Detmold.