thumb|Concretions in Torysh, Western [[Kazakhstan]] thumb|Concretions with lens shape from island in Vltava river, Prague, Czech Republic thumb|Marlstone aggregate concretion, [[Sault Ste. Marie, Michigan, United States]] A concretion is a hard and compact mass formed by the precipitation of mineral cement within the spaces between particles, and is found in sedimentary rock or soil. Concretions are often ovoid or spherical in shape, although irregular shapes also occur. The word concretion is borrowed from Latin , itself derived from concrescere , from con- and crescere .
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- Subclass of
- mineral aggregate
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- "Яйце динозавра" - конкреція, знайдена у "Долині динозаврів" Баін-Дзаг в пустелі Гобі, Монголія.jpg
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- Commons category
- Concretions
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Article · 中文
结核（Concretion）在地质学中，指在沉积岩或土壤中与周邊環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礦物组成，如菱铁矿、黄铁矿、石膏、磷灰石等。
Abstract from DBpedia / Wikipedia · CC BY-SA