One of the mysteries of the English language finally explained.
A greenish clay mineral of the illite group, found chiefly in marine sands.
- ‘The presence of glauconite indicates deeper water and low sedimentation rates, with less oxygenated conditions.’
- ‘At the base of the Reading Formation are several metres of brown clay-rich sand with glauconite, flint pebbles and oyster shells.’
- ‘In addition, colors that can be produced by using mixtures of the just-mentioned basic pigments, in some cases along with glauconite and charred bone, are also noted and illustrated.’
- ‘Rounded 1 mm grains of glauconite occur in the Pentecost Sandstone.’
- ‘Another source of slowly available potash is the clay-type mineral glauconite, commonly sold as greensand.’
Mid 19th century: from German Glaukonit, from Greek glaukon (neuter of glaukos ‘bluish-green’) + -ite.
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