A grain of sand is a network solid (covalent network solid).
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If the sand is totally silicon dioxide and is assumed to be a uniform volume of one cubic millimeter then the number would be approximately 2*10^19 molecules, or 20,000,000,000,000,000,000
The grain size of fine sand typically ranges from 0.075 to 0.425 millimeters in diameter.
If the grain is rounded, none.
A tiny piece of sand is called a grain of sand.
Its Flake. Sand contains grains of sand. Snow contains flakes of snow.