Nephrite and Jadeite.

The article presents discussion concerning American geology, discussing the composition, origin and use of Nephrite and Jadeite with the prehistoric civilizations of Central America. The author describes several examples of celts made up of the materials and provides analysis of their chemical composition. Comments are given theorizing the use of the items in early civilization, pointing to evidence suggesting their use as personal ornaments. Debate over the geographical origins of the material is also given.