- a greenish micaceous mineral consisting essentially of a hydrous silicate of potassium, aluminum, and iron and occurring in greensand, clays, etc.
Origin of glauconite
Examples from the Web for glauconitic
Historical Examples of glauconitic
The sponge (Stauronema carteri) is characteristic of the Glauconitic Marl.The Geological Story of the Isle of Wight
J. Cecil Hughes
The glauconitic grains of the Greensand formations are chiefly foraminiferal casts.
The beds in this series vary a good deal lithologically, some being sandy, others marly or glauconitic; fossils are abundant.
- 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