- a greenish micaceous mineral consisting essentially of a hydrous silicate of potassium, aluminum, and iron and occurring in greensand, clays, etc.
Origin of glauconite
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Examples from the Web for glauconite
The colouring matter is believed in every case to be glauconite.
Dark “green-sands,” very rich in glauconite, are followed by yellow sandstones with some flint.
Calcareous sands or impure limestones with glauconite are also by no means rare, an example being the well-known Kentish Rag.
They may be seen occupying these shells, and when the shell is dissolved away perfect casts of glauconite are set free.
The green sand when weathered is brown or rusty coloured, the glauconite being oxidized to limonite.
- a green mineral consisting of the hydrated silicate of iron, potassium, aluminium, and magnesium: found in greensand and other similar rocks. Formula: (K,Na,Ca) 0.5-1 (Fe,Al,Mg) 2 (Si,Al) 4 O 10 (OH) 2 .nH 2 O
C19: from Greek glaukon, neuter of glaukos bluish-green + -ite 1; see glaucous
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