luigite

例句：

1. 1. The construction site is covered in a layer of limestone dust.
   施工现场覆盖着一层石灰石粉尘。
2. 2. The limestone formations are visible from the hiking trail.
   从徒步小径上可以看到石灰石形成的地貌。
3. 3. The limestone quarry provides a significant source of building materials for the region.
   石灰石采石场为该地区提供了大量建筑材料。