kurnakite

例句：

1. 1. The kurnakite crystals are known for their unique color and clarity.
   库尔纳克石以其独特的颜色和透明度而闻名。
2. 2. The kurnakite mine is one of the largest in the world, producing some of the most valuable gemstones.
   库尔纳克矿是世界最大的之一，生产了一些最有价值的宝石。
3. 3. The kurnakite crystals were discovered in a remote part of the Amazon rainforest.
   库尔纳克石晶体在亚马逊雨林的一个偏远地区被发现。