keatite

例句：

1. 1. The mineral is usedin the production of glass and ceramics.
   这种矿物用于生产玻璃和陶瓷。
2. 2. Quartzite is a hard, durable material thatis commonly found in nature.
   石英岩是一种坚硬耐用的材料，通常在自然界中被发现。
3. 3.The quarry where the keatite was mined is located inthe mountains.
   开采石英岩的采石场位于山区。