Fig. 12.-An unusual perthitic K-feldspar, containing vermicular plagioclase, occurs in monzonitic rocks from Maronia pluton in Northern Greece.

The K-feldspar crystals that contain the vermicular plagioclase invade other K-feldspar crystals that lack the vermicular plagioclase (Reported by Collins, 1998). Work done by Georgios Christofides (Department of Mineralogy, Petrology, and Economic Geology, Aristotle University of Thessaloniki, 54006 Thessaloniki, Macedonia, Greece).