hellkite

例句：

1. 1. The mineral helkite is used in the production of ceramics.
   黑云母用于陶瓷的生产。
2. 2. Helkite is a mineral that can be found in many rocks.
   黑云母是一种可以在许多岩石中找到的矿物。
3. 3. The helkite mine is located in the mountains of central China.
   黑云母矿位于中国的中部山区。