In the village of Västilä in the municipality of Längelmäki (Finland), the stonemason quarries the primary rock, which was formed from approx. two-billion-year-old, former sea bed. Over millions of years, under intense heat and pressure, it has slowly developed into a qualitative stone with excellent sharpening properties. The main components of phyllite are quartz, feldspar and mica. The quality of the stone varies, so all the stones have to be worked individually by hand in order to sort out and separate harder and impure material. With phyllite, even very hard steel can still be ground and sharpened very well.