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Oolite is a sedimentary rock formed from ooids, spherical grains which are composed of concentric layers of calcite
From oo- + -lite, after German Oolit. A rock consisting of fine grains of carbonate of lime
Durable Rock, Medium Hardness Rock
Fine Grained Rock, Opaque Rock
Coquina is a sedimentary rock that is composed either wholly or almost entirely of the transported, abraded, and mechanically-sorted fragments of the shells of molluscs, trilobites, brachiopods, or other invertebrates
From Concha (Latin)+ Coquina(Spanish) +conch(English)= Couquina (mid 19th century)
Coarse Grained Rock, Opaque Rock