Oolite

n. egg stone, limestone containing rounded crystals which resemble fish eggs

An oolite (egg stone) is a sedimentary rock formed from ooids, spherical grains composed of concentric layers. The name derives from the Hellenic word oiòn for egg. Strictly, oolites consist of ooids of diameter 0.25-2 mm: rocks composed of ooids larger than 2 mm are called pisolites.
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n. oolite, egg stone, limestone containing rounded crystals which resemble fish eggs

(n.)
A variety of limestone, consisting of small round grains, resembling the roe of a fish. It sometimes constitutes extensive beds, as in the European Jurassic. See the Chart of Geology.
  

oolite /'ouəlait/
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