| concretion |
Concretion - A hard rock, usually imperfectly round, formed by precipitation from water in the pores of another rock and usually varying greatly in composition from that of the rock in which it occurs.
출처: csd.unl.edu/general/glossary-letter.asp
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| concretion |
a hard, compact aggregate of mineral matter in sedimentary or pyroclastic igneous rocks (ash or cinders), subspherical to irregular in shape, formed by precipitation from water solution, usually around some nucleus, such as a small chunk of shell or bone. Concretions generally are different in composition from the rock in which they occur and represent a concentration of some minor con-stituent in that rock.
출처: www.tc.umn.edu/~smith213/Glossary%20A%20F.htm
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| concretion |
Rounded mass of minerals usually developed around a fossil nucleus.
출처: digitalunion.osu.edu/r2rsummer04/ford.295/pages/gl...
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