The origin of the term jade

Jade, also known as jadeite, emerald, hard jade, Burmese jade, is a type of jade with a color of emerald green (called emerald) or red (called fei).
The name of jade comes from the name of a bird, whose feathers are very bright. The male feathers are red, named Feiniao, and the female feathers are green, named Cuiniao. Together, they are called jade. In the Ming Dynasty, after Burmese jade was introduced to China, it was named "jade".
Jade is a polycrystalline aggregate formed during geological processes, mainly composed of jadeite, clinopyroxene, and sodium chromite, reaching jade grade. Mostly semi transparent to opaque, rarely transparent.
In a broad sense, jade refers to the commercial name of gemstone grade jadeite with commercial value, which is a general term for various colors of gemstone grade jadeite. The narrow definition of jadeite refers to those green gemstone grade hard jadeite rocks. Geology refers to jadeite as a fibrous aggregate composed of pyroxene minerals, mainly composed of jadeite minerals, and mainly composed of jadeite rocks with Cr (chromium) as the coloring element. Jade that has reached gem level is very close to the theoretical value of hard jade in terms of composition. Fei represents red, and Cui represents green. It is the most precious and valuable jade, known as the "crown of jade".