Related Clues:
- Ridge of wind-blown sand
- Zen garden grains
- Hourglass particles
- Frank Herbert sci-fi series
- Seaside castle-building material
- Smooth down (surface)
- You must leave a cube smooth
- De-ice, in a way
- Sandy mound
- What some castles are made of
- Mound formed by the wind
- Dune constituent
- Seashore feature
- Very fine rock
- Poolside changing place