pumpellyite

例句：

1. 1. The crystal formations on the cliff face are a wonder of nature's beauty.
   悬崖上的晶体形成是一种大自然美丽的奇观。
2. 2. These stalactites and stalagmites are unique features of this cave system.
   这些石笋和石柱是这个洞穴系统的独特特征。
3. 3. The pumpellyite formation is visible from the observation deck.
   从观景台上可以看到石笋形成。