oolith

oolith

[oh-uh-lith]
noun Geology.
any of the component concretions of a piece of oolite.

Origin:
1780–90; oo- + -lith

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Collins
World English Dictionary
oolith (ˈəʊəˌlɪθ)
 
n
any of the tiny spherical grains of sedimentary rock of which oolite is composed

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
oolith   (ō'ə-līt')  Pronunciation Key 
A small, round grain consisting of calcium carbonate, silica, or dolomite. Ooliths have concentric layers that form around a nucleus, such as a shell fragment, a sand grain, or a pellet of alga. They typically have diameters of 0.25 to 2 mm. Ooliths usually form by inorganic precipitation.
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