- a concretionary nodule or mass, usually of calcium carbonate or of argillaceous carbonate of iron, traversed within by a network of cracks filled with calcite and other minerals.
Origin of septarium
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Examples from the Web for septarian
Another type of concretion, very abundant in many clays and shales, is the “septarian nodule.”
- a mass of mineral substance having cracks filled with another mineral, esp calcite
C18: from New Latin, from Latin septum
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