NODULE

Nodule

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 be hollow as geodes or vugs or filled with crystals and intricate geometric shrinkage patterns as in septarian nodules.

The above text is a snippet from Wikipedia: Nodule (geology)
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nodule

Noun

  1. A rounded mass or irregular shape; a little knot or lump.


The above text is a snippet from Wiktionary: nodule
and as such is available under the Creative Commons Attribution/Share-Alike License.

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