brookite

例句：

1. 1. The brookite crystals are a popular gemstone in the region.
   该地区流行的宝石是蓝晶石。
2. 2. The bluestone has been used for centuries as a symbol of purity and strength.
   这种蓝晶石被用作象征纯洁和力量的符号，已有数百年历史。
3. 3. The brookite was discovered by accident during a geological survey.
   蓝晶石是在一次地质调查中偶然发现的。