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山东淄砚形态天然,纹理美观且变化多样,刻制简朴,故深受书画家喜爱,淄砚产地颇多,假如以其地质年代判断,淄砚可以分为二类:一是与淄博盆地中石炭系上统太原组煤系地层有关;一是20世纪70年代所发现的砚材,产出地层为古生代寒武系。前一类产地为淄川罗村洞子沟,这就是历代文人所记述的淄砚。另一类产于淄河源的虞望山。罗村所产砚材,为井下开采,呈黑色,上层松疏,非良材,下层坚润为制砚的上品之材。砚材属粉沙质泥岩,所含矿物成分为显微晶质状方解石,褐灰色
Shandong Zi Yan is a natural, beautiful and varied texture, simple and inscribed, so loved by calligraphers and artists. There are many places for producing Zi-Yan. If it is judged by its geologic age, it can be divided into two categories: The Carboniferous Taiyuan Formation is related to the coal-bearing strata. The first is the Yan material discovered in the 1970s and the output strata are Paleozoic Cambrian strata. The former type of origin is Zichuan Luocun Dongzigou, which is described by ancient literati Zi Yan. Another type of Yu Wang Hill source produced in Ziyuan. Luocun produced Yan material, for the underground mining, was black, the upper loose, non-good material, the lower the sturdy system for the inkstone material. Yanyan is a silty sandstone containing mineral composition of microcrystalline calcite, brown gray