Grain size

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φ scale size range Wentworth name
< -8 > 256  mm boulder
-6 to -8 64–256 mm cobble
-5 to -6 32–64 mm pebble
-4 to -5 16–32 mm pebble
-3 to -4 8–16 mm pebble
-2 to -3 4–8 mm pebble
-1 to -2 2–4 mm granule
0 to -1 1–2 mm very coarse sand
1 to 0 0.5–1 mm coarse sand
2 to 1 0.25–0.5 mm medium sand
3 to 2 125–250 µm fine sand
4 to 3 62.5–125 µm very fine sand
8 to 4 3.9–62.5 µm silt
> 8 1/∞-3.9 µm clay
> 10 1/∞-0.97 µm colloid


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