The red silk curtain is known as one of the four famous names in China for its texture, tenderness, ink, color, brilliance and variety. The red silk stone, which was praised by the literati, was produced in the Zhuangshan Mountain in Linyi of Yelingyuan and the black hole in the top of the mountain in Qingzhou (the stone source in Heishan was exhausted and has been cut off for hundreds of years). "Qingzhou Fuzhi" and "Linyi County" contain: "The red silk stone is produced in Linyi County." The distance between the two cities is more than 20 kilometers apart. The texture of stone production is very similar and they are in the same vein. Linyi was under the jurisdiction of Qingzhou, so the ancient name of the red silk was called “Qingzhou red silk.” "Xi Qing Ji spectrum," said: "The red silk stone comes to Linxian County. Its color is red and yellow, and the best ones are hardly available. Therefore, the world is very rare. The Shiyan red ribbon is bright and unusual, but the ancient jade is the best. ."

Red stone was formed in the Ordovician Majiagou Formation 440 million years ago. It is a siliceous limestone. The mineral composition is mainly calcite, mica, quartz iron, etc. The hardness is above 4 degrees, and the stone is delicate and delicate. From the point of view of stone composition and hardness, it is indeed an ideal material for making oysters. The old rock of the Yazhuang Formation originates from the contact between the first rock section and the second rock section of the limestone that is 2-7 meters underground. The rock formation is thin, the rock is rare, and there are often mixed quartz lines. Dozens of stones per square stone, a few pieces of red silk stone. Blackstone is produced in the mountain top hole. The hole is blocked by stone sand and is only a foot high, allowing one person to crawl into it. The depth of the cave is more than ten feet deep, but it is only three feet high. Qu Jing can sit and quarry is extremely difficult. Song Tangyan's "Songlu" cloud: "State (Qingzhou) in the west forty miles in Montenegro, more than forty feet in the mountains, there is a hole in the plate and the cave, stone was born in the west wall of the cave, according to legend, Scarlet silk stone.