Nodule (geology)
Nodule (geology)
Small mass of a mineral with a contrasting composition to the enclosing sediment or rock.
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Readers' pathsAug 2026 – Oct 2026
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Chert
Hard, fine-grained sedimentary rock composed of cryptocrystalline silica.
29%
Flint
Cryptocrystalline form of the mineral quartz.
23%
Concretion
In geology, a type of compact mass.
14%
Manganese nodule
Mineral concretion found on the sea bottom.
13%
Phosphorite
Sedimentary rock containing large amounts of phosphate minerals.
10%
Pyrite
Iron (II) disulfide mineral.
4.1%
Fossil
Preserved remains or traces of organisms from a past geological age.
2.7%
Shale
Fine-grained, clastic sedimentary rock.
2.7%
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Concretion
In geology, a type of compact mass.
25%
Flint
Cryptocrystalline form of the mineral quartz.
18%
Geode
Hollow formation inside a rock.
13%
Chert
Hard, fine-grained sedimentary rock composed of cryptocrystalline silica.
9.8%
Thunderegg
Nodule-like rock, that is formed within rhyolitic volcanic ash layers.
4.6%
Manganese nodule
Mineral concretion found on the sea bottom.
4%
Agate
Banded variety of chalcedony.
2.5%
Out-of-place artifact
Artifacts that challenge historical chronology.
2.2%
Grime's Graves
Flint mine.
1.4%