单元粒子是单晶体构成的细小的粘土颗粒，是由一种或多种层状结构的硅酸盐构成的混层粘土的基本单元。
The fundamental particle is the very fine clay particle composed of single crystal, and is the basic unit of mixed layer clays formed by one or several kinds of silicates with the sheet structure.
蒙脱土是一种具有2：1型层状硅酸盐晶体结构的天然矿物质。
MMT is a kind of natural minerals with the crystal structure of 2:1 layered silicates.
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