River Shell -(Fresh water Shell). Crushed fragment.
Magnification - 100 Times.
Inside of the Shell.
Outer surface of the shell. Looks like rock surface.
magnification - 100 Times.
Outer surface of the shell. White colored layer is the second
layer. It's broken in the edge.
Crushed fragments. Magnification - 100 Times.
The freshwater mussel has a shell consisting of two parts that are hinged together, which can be closed. The shell is made of calcium carbonate and protein.
This image source: Wikipedia.
River Shell Photos -Link - flyinamber.blogspot.com