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oolith
A more or less spherical particle of rock which has developed by the accretion of material about an initial nucleus. The accretion may be concentric (so that in cross-section circular bands of material may be seen) or radial, and combinations are known. Larger ooliths are termed pisoliths. Concentration of ooliths can form, for example, oolitic limestones, often called oolites.
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