magnesian calcite

例句：

1. 1. This 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 magnesian calcite is a common mineral found in many riverbeds.
   镁石方解石是一种常见的矿物，存在于许多河床中。
3. 3. The minerals are mined from the earth's crust, which contains magnesian calcite.
   这些矿物是从地球的地壳中开采出来的，地壳中含有镁石方解石。