四库全书《西清砚谱》云:“红丝石出临朐县,其色红黄相间,佳者绝不易得,故世罕流传,是砚红丝映带,鲜艳逾常,而质如古玉。洵为佳品。”仅产于山东临朐老崖崮的红丝石砚,与端、歙、洮砚,齐称中国四大名砚。红丝石为硅质灰岩,硬度为四度左右了,石质细腻,致密而坚实,岩层较薄,料石稀有,大材极不易得,而今该石资源 Sikuquanshu “West Qing Yan spectrum” cloud: “red silk stone Pro Lin County, its color red and yellow, the best of which is not easy to get, so rare in the world, is the Yan Hong silk screen, bright more than normal, and quality such as Ancient jade. 洵 is the best product. ”Only produced in Shandong Linqu old cliffs of red silk stone inkstone, and end, 歙, 洮 Yan, collectively known as China’s four famous inkstone. Red silk for the siliceous limestone, the hardness of about four degrees, the stone is delicate, dense and solid, thin rock, stone rare, extremely difficult to obtain, and now the stone resources