Pōhaku (stone)

Summary: 
Stone.
Description: 

Lava Rock. Length: 3 1/4 (at widest point) inches, Width: 2 1/2 inches (at widest point), Thickness: 2 inches (at widest point), Surface: Porous, Shape: A triangular stone stuck on top of a smaller triangular stone, Weight: 6.8 oz. Origin and use of this rock is unknown. It appears to be worn down on the bottom of the smaller triangle. This couls suggest that the stone was used to rub or to polish but this is not a conclusive observation.