gratonite

例句：

1. 1. The gratonite in the museum is a rare and valuable specimen.
   博物馆里的格拉通石是一种罕见的珍贵标本。
2. 2. The gratonite has been used for centuries as a symbol of strength and resilience.
   格拉通石被使用了几个世纪作为力量和韧性的象征。
3. 3. The gratonite mine is located in a remote area, making it difficult to access.
   格拉通石矿位于一个偏远地区，这使得它难以到达。