A type of sedimentary rock or sand with a greenish color, typically containing glauconite mineral, often found in ancient seabeds and used in foundry work.
From 'green' plus 'sand,' referring to the characteristic green color caused by the mineral glauconite. Greensand formations are common in Cretaceous and Tertiary deposits worldwide.
Greensand gets its color from a mineral called glauconite, which forms only in ocean water and is essentially ancient potassium-rich clay that crystallized on the sea floor millions of years ago!
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