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来自维基百科,自由的百科全书
结核(Concretion)在地质学中,指在沉积岩或土壤中与周边环境成分有明显区别的某种矿物团块。其形状有球形、卵形及各种不规则形状。内部构造式样很多,有同心圆状、放射状等。大小差别很大,直径从几厘米、十几厘米至几米不等。常见的结核主要是由化学沉淀的矿物组成,如菱铁矿、黄铁矿、石膏、磷灰石等。[1][2]
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