Do you know the origin of the jadeite buckle?

The Pingan buckle, the traditional circular ornament of the simple and ineffective, is only three or five centimeters in diameter, but it has been given a simple and simple meaning of "peace". From the appearance of the safety buckle, its outer circle is .......

Medicinal and therapeutic effects of amber

The first record of amber medicine is to be traced back to ancient times. The main ingredients of the drug at that time were derived from natural minerals such as plants, animals and minerals. The original recipe of “Nicolaus Copernicus” preserved in Sw.......

Use of quartz sand

Quartz sand is an important industrial mineral raw material widely used in glass, casting, ceramics and refractory materials, metallurgy, construction, chemicals, plastics, rubber, abrasives and other industries.