How do Mikage stones affect the quality and taste of matcha?

Mikage – the heart of authentic matcha

In the world of high-quality matcha, milling technology is fundamental – and at the very top of this tradition are Mikage stones, hand-carved millstones made of granite from the Okayama region of Japan.

Why are Mikage stones unique?

Mikage stones are not "stones" in the colloquial sense – they are precisely crafted millstones made of hard, even-grained granite that provides an ideal balance between durability and cooling. They are used exclusively in the production of ceremonial-grade matcha.

Their biggest advantage is that they grind the leaves slowly and cold – usually at a speed of just 30–40 g of matcha per hour. This keeps the temperature below 30–35°C, protecting delicate aromas, L-theanine, chlorophyll, and antioxidants.

Unlike industrial steel or ceramic mills, Mikage stones do not cause oxidation, do not burn the leaves, and do not create dust. The final powder is silky, uniform, smooth, and fragrant with umami.

Can everyone use Mikage?

Theoretically, yes – but in practice, it is a costly and time-consuming process. Mikage stones are mainly used by the best mills in Kyoto and Uji because their operation requires experience. The millstones must be manually adjusted every few weeks, and their surface regularly renewed. It is a craft in itself.

Many producers choose a cheaper alternative – industrial disc or impact mills. They are fast (up to 10 kg/h), but they heat the leaves, which lowers the quality of matcha, especially high-grade matcha.

Mikage is not just tradition – it's a decision about quality

From my experience – both as a consumer and as someone following the matcha market – I know one thing: the difference in taste between matcha milled with Mikage and industrially milled matcha is noticeable even for beginners.

The taste is deeper, more velvety, without bitterness. Mikage are therefore not just a symbol of tradition – they are a concrete decision about quality, taste, and authenticity.