mineralized

adjective [原级] 矿藏丰富的

By fossils, we mean traces of prehistoric animals such as bones, which become mineralized, or impressions of bones or organs that are left in stone. 我们所说的化石，指的是史前动物的遗迹，如已矿化的骨头，或留在石头上的骨头或器官的印痕。