Related Clues:

• Component of concrete
• Fine stone particles
• It's found lying on the beach
• "Remember (Walking in the ___)"
• Collection of tiny moving parts in old-fashioned timer
• George __, the pseudonym of Amantine-Lucile-Aurore Dupin
• Zen garden grains
• Hourglass particles
• Seaside castle-building material
• Smooth down (surface)
• You must leave a cube smooth
• De-ice, in a way
• What some castles are made of
• Dune constituent
• Very fine rock