Grain, Bead, Counter For Grains
counter, independent noun
Grains are made of single grains. You can also use this to refer to a bead or use it as a counter for grains.
つぶ
You take all the grain and put it in a tube (つぶ). Just imagine doing this, grain by grain.
私は一粒の岩塩をオブラートで包みました。
I wrapped a single grain of rock salt in a wafer.