Properties
No property table for this entry: the article it resolves to has no infobox, so Mohs hardness, crystal system and the other properties are not available. Nothing has been estimated or added.
From the Wikipedia article
A concretion is a hard and compact mass formed by the precipitation of mineral cement within the spaces between particles, and is found in sedimentary rock or soil. Concretions are often ovoid or spherical in shape, although irregular shapes also occur. The word concretion is borrowed from Latin concretio '(act of) compacting, condensing, congealing, uniting', itself derived from concrescere 'to thicken, condense, congeal', from con- 'together' and crescere 'to grow'.
Source
Source record: crystal-compendium/septarian/minerals.json. Fetched from English Wikipedia by the operator 2 October 2026.
https://en.wikipedia.org/wiki/Concretion — revision id 1367576057. Text and properties from Wikipedia, licensed CC BY-SA 4.0.