concretionary

[ kon-kree-shuh-ner-ee, kong- ]

/ kɒnˈkri ʃəˌnɛr i, kɒŋ- /

formed by concretion; consisting of concreted matter or masses.

Origin of concretionary

First recorded in 1820–30; concretion + -ary

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.

Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 7 |Various
The mineral is occasionally found as concretionary masses (sphaerosiderite) in cavities in basic igneous rocks such as dolerite.

Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 7 |Various
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.

Encyclopaedia Britannica, 11th Edition, Volume 14, Slice 4 |Various