mixed coal and clay 煤 ; 煤泥
coal based clay 煤系高岭土
coal series clay 煤系粘土
clay-coal 土层煤
coal series clay minerals 煤系粘土矿物
Coal deposits, after all, are petrified peat swamps, and peat is made from decaying plants, which leave their imprints in mud and clay as it hardens into shale stone.
毕竟煤炭矿床本身就是石化的泥炭沼泽，而泥炭的成份是腐烂的植物。当粘土泥浆逐渐硬化成页岩石，腐烂的植物则在上面留下了它们的印记。
Mixing clay with coal is much cheaper than burning large blocks of coal.
将煤粉与黏土混合制成的煤球比块煤便宜得多。
This seam of coal reposes on a layer of clay.
这个煤层处于一层黏土岩之上。
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