nodular chert

例句：

1. 1. The nodular chert formations are a unique geological feature of this region.
   这种地区的结核石岩形成是一种独特的地质特征。
2. 2. The nodular chert is highly prized for its beauty and durability.
   结核石因其美丽和耐用性而备受珍视。
3. 3.The discovery of this type of nodular chert has opened up new possibilities for mining and exploration.
   发现这种类型的结核石为采矿和探索开辟了新的可能性。