spiculite

例句：

1. 1. The mineral is known for its hardness and durability.
   这种矿物以其硬度和耐用性而闻名。
2. 2. Quartzite is often used in jewelry making due to its high refractive index.
   由于其高折射率，石英岩常用于珠宝制造。
3. 3. The quartz crystal was found in the mine, which is located in the southern part of China.
   该石英晶体在位于中国南部的矿山中被发现。