Alcatraz Penitentiary - SOLD 2.77" Showcase Concrete fossilplant Above: Wilford Brimley voiceover with

Above: Wilford Brimley voiceover with stories about fly fishing and fossils not included

New York: Nova Science Publishers

The abalone nacre can appear as blue

Agni Manitite is a type of volcanic glass which forms as airborne lava cools in free fall

Alcatraz Penitentiary - SOLD 2.77" Showcase Concrete fossilplant Above: Wilford Brimley voiceover withThis is an authentic piece of concrete from Alcatraz Penitentiary. Yes, an actual piece of The Rock!" This particular specimen measures 2. 77" 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.