concretion

The process of aggregating or coalescing into a mass.

A solid, hard mass formed by a process of aggregation or coalescence.

A rounded mass of a mineral, sometimes found in sedimentary rock or on the ocean floor.

Of the three beds, the central one is the most compact, and more like ordinary sandstone: it includes numerous flattened spherical concretions.

The action of making something concrete or the result of such an action.

"My new statue!" said Kenyon. . . . "It is the concretion of a good deal of thought, emotion, and toil of brain and hand."