Granule (noun)

1. A small grain or particle of a substance.
2. A tiny particle of a solid material, especially one that is one of many making up a larger structure.
3. A small unit of a drug or other substance used in medicine.

Origin:

Late 16th century (originally denoting a small grain of a substance): from latin granulum, diminutive of granum 'grain', from the same root as grain.

Examples:

1. The sand was composed of granules of various sizes and colors.
2. The granules of the rock were tightly packed and compacted over time.
3. The medication comes in granules that are dissolved in water before use.
4. The granules of sugar were sprinkled on top of the cake for a sweet crunch.
5. The granules of salt were added to the soup to enhance the flavor.