Scientific Name:
Group: Fossil specimens
Chemical composition:
Colors: Red, pink, black, blue, golden
Hardness:
Principal Sources: Worldwide
Special Notes: Agatized coral is often referred to as Petoskey stone or agate. Fossils form when an organism is rapidly covered by silt . The soft tissue dissolves, leaving the skeleton or shells to be reaplced by other minerals as successive layers of sediment accumulate and are turned to rock.