sagvandite

例句：

1. 1.The sagvandite formation is a unique geological feature in the region.
   沙冈石形成是该地区独特的地质特征。
2. 2. The sagvandite has been used in various applications due to its unique properties.
   由于其独特的性质，沙冈石被用于各种应用。
3. 3.The sagvandite mine is one of the largest in the world, with a rich history dating back to ancient times.
   沙冈石矿是世界最大的之一，有着悠久的历史，可以追溯到古代。