schraufite

例句：

1. 1. The fossils found in the schraufite are incredibly rare and valuable.
   在石炭纪石灰岩中发现的化石极其罕见且珍贵。
2. 2.The schraufite formation is a major source of building materials for many ancient civilizations.
   石炭纪石灰岩是许多古代文明的主要建筑材料来源。
3. 3.The schraufite deposit was discovered by a team of geologists during their research in the area.
   地质学家团队在该地区进行研究时发现了石炭纪石灰岩矿床。