Septarium n. (pl. septaria) (Geol.) A flattened concretionary nodule, usually of limestone, intersected within by cracks which are often filled with calcite, barite, or other minerals.
... iron-stones is that of an oblate or much compressed sphere, and the size from two or three inches diameter to more than a foot. In the circular or horizontal section, they present the most elegant septarium[9]; and, from the examination of this particular structure, the following ... — Theory of the Earth, Volume 1 (of 4) • James Hutton
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