表面粗糙呈灰色的石材。 坚固且耐风化，常用于基础建筑和简易防御结构，加工也很方便。多见于水边和沙漠地区。
Stone with a rough, gray surface. Sturdy and resistant to weathering, it is used for basic construction and simple defensive structures, and is also easy to process. Commonly found near bodies of water and the desert.