結核（Concretion）在地質學中，指在沉積岩或土壤中與周邊環境成分有明顯區別的某種礦物團塊。其形狀有球形、卵形及各種不規則形狀。內部構造式樣很多，有同心圓狀、放射狀等。大小差別很大，直徑從幾厘米、十幾厘米至幾米不等。常見的結核主要是由化學沉澱的礦物組成，如菱鐵礦、黃鐵礦、石膏、磷灰石等。[1][2]
參考資料
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