illite hydromica

例句：

1. 1. This rock is composed mainly of illite hydromica.
   这种岩石主要由硅酸盐矿物组成。
2. 2. The illite hydromica in the soil can be used to improve its fertility.
   土壤中的硅酸盐矿物可以用于提高其肥力。
3. 3. The illite hydromica in the soil plays a crucial role in maintaining soil structure.
   土壤中的硅酸盐矿物在保持土壤结构方面起着至关重要的作用。