自古山东砚石丰富，红丝石、淄石、尼山石、紫金石等在唐宋时期便已享有盛名。
Since ancient times , ink stones were rich in Shandong , such as : Hongsi stone , Zi stone , Nishan stone , Zijin stone and so on were already renowned in the Tang and Song Dynasties .
紫金石