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It is a Japanese Furuya stone (SUISEKI / ENZANSEKI / SUGATAISHI).
Furuya stone is mountain stone(Stone in soil) mined from mountain.
Most of suiseki is Kawa ishi (stones from a river).
Mountain stone like Furuya stone is few.
Suiseki is Japanese culture or hobby of viewing stones indoors.
It is a stone of a very beautiful externals.
total weight: 1800g
Condition: used / Some stains, but in good condition.