This could be trace evidence
Gold in small bits or powder is called gold dust.
Gemmaes.
Chain of custody log
You call the bits of soil sediment.
Substances in solution do not have solid bits unless the solution is already saturated.
8 Bits is one Byte. Half of a byte (4 bits) is a nibble.
asteroids belt
16 bits is a byte, for the record half a byte is called a "nibble". I kid you not...
silt
Datum
Smaller rocks.
chicken mic bites