Why Matcha Is Stone-Milled: Particle Size and Texture
Tencha is ground into matcha using a stone mill. Faster methods exist, so the persistence of this one deserves an explanation.
You are drinking the leaf, not an infusion
Sencha and black tea are steeped, and the leaves discarded. Only the dissolved compounds reach your mouth.
Matcha is ground leaf mixed into liquid. The powder does not dissolve — it stays suspended as very fine particles. You are effectively eating the leaf, which is why particle size translates directly into mouthfeel.
Coarse feels gritty
Larger particles register on the tongue and leave a residue after swallowing.
Finer particles feel smooth and integrate with the liquid. The same leaf, milled differently, produces a noticeably different drink.
Why the mill turns slowly
Speed generates friction, and friction generates heat. Heat drives off aroma compounds and degrades the green pigment.
Turning slowly keeps the temperature down. It is not efficient — a stone mill produces roughly 40 g of matcha per hour — but it preserves color and aroma while achieving very fine particles.
How fine
Matcha particles land around 10 microns, and the better grades reach 1 to 5 microns.
| Particle size | |
|---|---|
| Wheat flour | 30–60 microns |
| Typical powdered tea | 20–50 microns |
| Fine matcha | 1–5 microns |
An order of magnitude finer than flour. That is why matcha feels closer to silk than to powder between your fingers.
Fineness affects mixing too
Finer powder incorporates into water more readily and clumps less. Coarser powder needs more attention.
That said, any powder will clump if you add a large volume of liquid at once. Work it into a paste with a small amount first, then add the rest.
Machine milling exists
Grinding mechanically is far faster and handles much larger volumes. The trade-off is heat and a coarser particle size.
For matcha destined for baking or blending into other foods, coarse is not a problem. For something you drink directly, the difference shows.
Some settling is normal
Even well mixed, a little powder collects at the bottom of the cup. Since you are drinking ground leaf, that is expected rather than a defect.
