Alcatraz Penitentiary - SOLD 2.77" Showcase Concrete eocene (Source: Detlev Van Ravenswaay

(Source: Detlev Van Ravenswaay

is known best for its multicolor formations of a deep

Beginning with rare gems formed in the heart of an asteroid during the formation of the solar system

Above: Front of specimen card

Visions of the Prehistoric Past" by Zoë Lescaze

Alcatraz Penitentiary - SOLD 2.77" Showcase Concrete eocene (Source: Detlev Van RavenswaayThis 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.