What is a flattened concretionary nodule, usually of limestone, intersected within by cracks which are often filled with calcite, barite, or other minerals called?
septarium — A flattened concretionary nodule, usually of limestone, intersected within by cracks which are often filled with calcite, barite, or other minerals. (Webster's 1913.)
Sources
- Webster's Unabridged Dictionary, 1913 edition (public domain, via GCIDE / Project Gutenberg).
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