Pisolite
Pisolite , noun
[Greek {not transcribed} a pea + -lite: compare French pisolithe.]
(Mineralogy) A variety of calcite, or calcium carbonate, consisting of aggregated globular concretions about the size of a pea; -- called also peastone, peagrit.
Oolite is similar in structure, but the concretions are as small as the roe of a fish.