Patented batch mill for grinding soft, fibrous, hard and brittle materials (up to Mohs hardness 5) at speeds of up to 25,000rpm. The transparent grinding chamber holds up to 40 ml. Convenient and safe to use while assuring high safety and reproducibility. The mill is suitable for grinding seeds, bones, pigments, roots, charcoal, pills, etc. Dry ice can be used for cooling samples. Eliminates cross-contamination and requires no cleaning.