greensand marl
geology
Quick Summary
Greensand marl is an earthy mixture of fine-grained minerals, with a composition that can vary widely. It is characterized by the presence of dark greenish grains of glauconite, a mica mineral rich in potassium, often mixed with clay or sand.12
This type of marl is found widely distributed, particularly along the Atlantic coasts of the United States and Europe. Greensand marls are notable for their use as water softeners.2
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