Examples from the Web for concretionary
He pronounces it "a superficial highly ferrugineous sandstone, with concretionary veins and aggregations."Discoveries in Australia, Volume 1.|J Lort Stokes
These examples will indicate the great variety of substances which may give rise to concretionary structures.
The mineral is occasionally found as concretionary masses (sphaerosiderite) in cavities in basic igneous rocks such as dolerite.
Some shew a flaky or laminated structure; others are concretionary.Geology|James Geikie
Kankar or ghutin (concretionary carbonate of lime) is collected for this purpose from the river-beds and alluvial deposits.