Greensand, or green sand, is a sand or sandstone which has a greenish color.

Greensand or green sand may also refer to:

• Green sand (casting), slightly damp sand, used in sand casting of metals
• Olivine sand, which can form green sand beaches
• Project Greensand aims to store captured CO₂ on the ocean floor of Denmark's North Sea region

• Lower Greensand Group, a geological unit in southeast England

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