The material appears to actually be a sort of soft stone. The carved piece appears to represent the area of Eastern Virginia. There is a red star that most likely shows where Richmond was located. Just an extremely rare and one of a kind piece.
The item "CIVIL WAR SOLDIER'S CARVED PIECE OF ART MADE AT LIBBY PRISON, VA" is in sale since Friday, May 15, 2020. This item is in the category "Collectibles\Militaria\Civil War (1861-65)\Original Period Items\Other Civil War Original Items". The seller is "trader1862" and is located in Easley, South Carolina.
This item can be shipped to United States.