Mid-Precambrian limestone and dolomite of the Matenrei system, metamorphosed to serpentine-bearing marbles by a granitic intrusion. A village about 25 km NW of Kisshu city in northeastern North Korea.
Ref: Satou, S. (1933) Alteration of talc and antigorite to leuchtenbergite in the metamorphosed dolomite of the Matenrei system, North Korea. Journal of the Shanghai Science Institute, Sect. 2, vol. 1, 17-24.