septarian nodule

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Nodule (geology) — A nodule in petrology or mineralogy is a secondary structure, generally spherical or irregularly rounded in shape. Nodules are typically solid replacement bodies of chert or iron oxides formed during diagenesis of a sedimentary rock. Nodules may… … Wikipedia
Concretion — For other uses, see enterolith and nodule (geology). Septaria redirects here. For the genus of gastropods, see Septaria (gastropod). Concretions on Bowling Ball Beach (Mendocino County, California) weather out of steeply tilted Cenozoic mudstone… … Wikipedia
Geode — For other uses, see Geode (disambiguation). Geode, halved and polished … Wikipedia
septarium — septarian, adj. septariate /sep tair ee it/, adj. /sep tair ee euhm/, n., pl. septaria / tair ee euh/. Geol. a concretionary nodule or mass, usually of calcium carbonate or of argillaceous carbonate of iron, traversed within by a network of… … Universalium
septarium — /sɛpˈtɛəriəm/ (say sep tairreeuhm) noun (plural septaria /sɛpˈtɛəriə/ (say sep tairreeuh)) a concretionary nodule or mass, usually of calcium carbonate or of argillaceous carbonate of iron, traversed within by a network of cracks filled with… …

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