hartite

例句：

1. 1. The mineral is used in the production of glass and ceramics.
   这种矿物用于生产玻璃和陶瓷。
2. 2. Quartzite is a type of rock that contains quartz crystals.
   石英岩是一种含有石英晶体的岩石类型。
3. 3. The hardness of quartzite makes it ideal for construction purposes.
   石英岩的硬度使其成为建筑的理想材料。