Alcatraz Penitentiary - SOLD 2.52" Showcase Concrete showcasejewelry2025sale20 An informational photo card and

An informational photo card and a larger specimen card

grinding in opposite directions for 750 miles

the creatures will be quite tiny if they are present

The animal's shell has been fossilized is exquisite detail and the ribbed

Alcatraz Penitentiary - SOLD 2.52" Showcase Concrete showcasejewelry2025sale20 An informational photo card andThis is an authentic piece of concrete from Alcatraz Penitentiary. Yes, an actual piece of The Rock!" This particular specimen measures 2. 52" along the widest point. This specimen, from the famous Alcatraz island, saw some 1,500 prisoners pass by it during the prison's operation. A certificate of authenticity is included.