天青石

The current preperation methods of strontinum carbonate from celesite are carbon reduction method and double decomposition method.

中国天青石资源十分丰富,但矿石品位低、杂质含量高,需经选矿除杂后才能作为生产碳酸锶。

Swimming about the capstone, which the Arizona diver thought looked like lapis lazuli, he discovered an entranceway and decided to explore further.

绕着顶石游，亚利桑拿州潜者认为其看起来像天青石，一个入口而决定进一步探索。