Nuclear electromagnetic pulse (NEMP), as a result of a nuclear explosion. A variant of this is the high altitude nuclear EMP (HEMP), which produces a secondary pulse due to particle interactions with the Earth's atmosphere and magnetic field. Non-nuclear electromagnetic pulse (NNEMP) weapons. Lightning
Central American cultures would sometimes hold jadeite against their sides to help cure ailments, which is why the Spanish called jadeite piedra de ijada, meaning stone for the pain in the side. On the other side of the world, the Chinese called jade yu, meaning heavenly or imperial and has been found in the tombs of some Shang dynasty kings and other important figures.
In China, where jade has been treasured the most, there was only nephrite before the 18th century. The highly treasured pieces from that time are creamy white in color and uniformly translucent. Since the mid-18th century, jadeite has been imported from Burma (now Myanmar), and has become the most popular form of jade in China. Besides in Burma, jadeite is also found in Japan, part of the former Soviet Union, Central America, and California. The actual color and the texture of the jadeite piece derives from the metallic element(s) it contains and the way the piece was formed geologically. Green jadeite, known as fei tsui in Chinese, seems to be used almost exclusively in jewelry-setting, and is the most popular type of jadeite.