What is the representative significance of jet in ancient times?

Jet is a precious and rare natural resource, which is only produced in the northern mountainous area of Fuping County, Shaanxi Province. It is very famous for its heavy and greasy color, delicate texture, black as ink, bright and lovely. Its hardness is about Mohs4o, and it is known as a precious material for processing inkstones and knives. The ancients called it "gem", which can be divided into diamonds, precious stones and colored stones.

The reason why jet is very precious and rare in the world is that its natural structure and formation take a long time and conditions in the universe. The ink color is not black, nor carbon and gray. Ink is not the natural color of matter in the universe. It is formed by emerald entering the long universe and slowly turning black under the action of cosmic rays. So, the longer it takes, the darker it gets. But under the strong light, it still appears dark green. In other words, it takes more than 10 billion years for a truly natural jet to form, from wall jade to jet and then to jet.

From the representative point of view, Mo Yu should use some kind of image carrier.

Besides, the birthday girl in August is jet.

I hope I can help you, Shanniu. . .