River Rock has a loyal following. The softer rounded pieces with the unusual shapes is something you expect to find near a river or stream. Owners of homes near the water, or in the North Woods love this stone. The tones of the rock are a bit muted and usually have tones of charcoal, brown earth tones, rusts and shades of the darker granite types of red. These stones are installed with a mortar joint and work well on both interior and exterior projects.