The content of each major mineral is basically positively related to the content of major elements, but SiO2 is not related to the content of a majority of minerals containing SiO2, because the existing shape of SiO2 is probablely complex.

• 各主要矿物含量基本与其主要元素含量正相关,但SiO_2与其组成的大多数矿物含量不相关,可能因SiO_2存在形式复杂所致。