Historical reference: Do not rely on this information. It is very old. About this collection
Jadeite, a silicate of aluminium and sodium, related to epidote, but resembling jade, from which it differs in greater hardness and weight, its specific gravity being 3.28 to 3.35. It occurs in Yunan and Burmah, and implements, etc., made of it are found in Egypt, Switzerland, Mexico, and Costa Rica.