Monzonite
Marturu, Ongole, Prakasam District, Andhra Pradesh, India
Cross section through monzonite from Marturu, Ongole, Andra Pradesh, India, trade name "Steel Grey". Section manufactured by Rudolf Schwinghammer, München.
Rudolf Schwinghammer collection (No. G0241), G. Grundmann photo.
© Günter Grundmann, Detmold.