Orbicular Gabbro in Jeonpo-dong, Busan

Orbicular rock is spherical rock formed under special environmental conditions, and it is mostly found within granite. The orbicular gabbro of Jeonpo-dong, Busan, however, takes the form of orbicular rock embedded within a body of gabbro measuring 400 m in length and 300 m in width, and this is the only recorded example of this rare rock type in Asia. The diameter of the orbicular rock ranges from less than 1 cm at the smallest to 5–10 cm at the largest, and its colour is dark greenish grey to pale grey. The orbicular gabbro of Jeonpo-dong, Busan, is highly important for studying the process of rock formation, and being an extremely rare and unusual rock, it holds great value for geological research.

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Where it is

Region

Busanjin-gu, Busan

Designation

Natural Monument · 천연기념물