闪石

例句：

1. 1. The mineral is composedmainly of quartz.
   这种矿物主要由石英组成。
2. 2. Quartz is a common rockfound in many places around the world.
   石英是一种在世界许多地方都能找到的常见岩石。
3. 3. The crystals are often used asgemstones and in jewelry making.
   这些晶体通常被用作宝石和珠宝制作。