hard mica

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. The hard mica can be ground into a fine powder for use in paints.
   这种硬云母可以被磨成细粉，用于油漆中。
3. 3. The hard mica has a unique luster that makes it suitable for decorative purposes.
   这种硬云母具有独特的光泽，使其适合装饰用途。