The coarseness of a material can be determined by several factors:

1. Particle size: In general, materials with larger particle sizes are coarser than those with smaller ones.

2. Surface roughness: A rough surface will give a coarser feel to the material.

3. Density: Materials with a higher density will generally feel coarser than those with lower densities.

4. Porosity: A material with more pores or voids will typically feel less coarse than a denser material.

5. Hardness: Harder materials may feel coarser than softer ones due to the roughness of the surface.

6. Frictional properties: Materials that are more abrasive or have a higher coefficient of friction generally feel coarser.

7. Moisture content: Materials that are dry tend to feel coarser than those that are wet or have a higher moisture content.

8. Chemical composition: Certain chemical properties of a material can contribute to its coarseness, such as the presence of sharp edges or particles.
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