ooid

ooid
1. noun
A small calcium carbonate or iron coated grain found on the seafloor.
Shaped like an egg; ovoid; ovate.

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  • oolite — noun /ˈuː.laɪt/ a) A rock consisting of spherical grains within a mineral cortex accreted around a nucleus, often of quartz grains. b) An ooid or oolith …   Wiktionary

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