grapholith

例句：

1. 1. The geologist used a grapholith to map the distribution of minerals in the area.
   地质学家使用一个图石来绘制该地区矿物分布的地图。
2. 2.The rock diagram revealed that the mountain was formed by erosion over millions of years.
   岩石图样揭示了这座山是经过数百万年侵蚀形成的。
3. 3. The grapholith helped scientists understand the geological history of the region.
   图石帮助科学家理解该地区的地质历史。