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来自维基百科,自由的百科全书
鲕粒灰岩(英文:Oolite),又称鸡蛋石(Egg stone)是一种鲕粒(由同心层组成的球粒)。其名字源于希腊语boion的鸡蛋。严格的说鲕粒岩是由直径为0.25至2mm的鲕粒组成,而颗粒大于2mm时则称之为豆石。鲕粒类包括鲕粒岩和工业鲕粒。
鲕粒灰石呈球状,具有类似洋葱的层状构造。其形成一般认为是由于核被水不断搅动,碳酸钙绕核沉淀,不断长大。也有证据表明,其形成与一种藻类有关。[1]
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