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Volcanic minerals discovered in Istanbul, around the area of the mythic Symplegades or Clashing Rocks: 1) The western side of Yum Burnu promontory, on the norheastern shore of the Bosporus, at the junction with the Black Sea. 2. Agglomerate of volcanic minerals with porphyry veins from Kadiköy (anc. Chalcedon), discovered by the author at Buyuk Liman, on the norheastern shore of the Bosporus. 3) Porphyry from Kadiköy (anc. Chalcedon). 4) Basalt from Buyuk Liman, norheastern shore of the Bosporus. 5) The eastern side of the northeastern end of the Bosporus, at the junction with the Black Sea.