中国北方石炭二叠纪和侏罗纪煤系中普遍产出一种可塑性极高的软质粘土，又称木节土，其矿物组成以高岭石为主。
A kind of high plasticity soft-clay, also called kibushi clay, is widely deposited in Carboniferous-Permian and Jurassic coal-bearing strata in northern China.
本溪组成矿系列主要有g层铝土矿，其次是山西式铁矿、硬质耐火粘土矿、软质耐火粘土矿和伴生镓元素。
The minerogenetic series of the Benxi Formation mainly includes G-bed bauxite, followed by Shanxi -type iron ores, stiff fireclay, soft fireclay, and associated gallium elements.
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