Feinkörniger

Feinkörniger is a German adjective meaning “fine‑grained” and is used primarily in the natural sciences to describe materials whose constituent particles are small and uniformly sized. In geology, a feinkörniges Gestein (fine‑grained rock) such as shale, mudstone or certain volcanic ash consists of mineral grains typically smaller than 0.062 mm, which gives the rock a smooth texture and affects its mechanical properties and weathering behavior. In soil science the term feinkörniger Boden refers to soils with a high proportion of silt and clay particles; such soils retain water and nutrients efficiently but may exhibit limited drainage and compaction resistance.

In material science the expression feinkörniger Werkstoff denotes metals, ceramics or polymers that have been processed to achieve a refined microstructure. Techniques such as rapid cooling, severe plastic deformation or powder metallurgy can produce a feinkörnige Mikrostruktur, which generally enhances strength, toughness and fatigue resistance according to the Hall‑Petch relationship.

The concept also appears in food technology, where feinkörniger Zucker describes granulated sugar with a small crystal size, providing a smooth mouthfeel and rapid dissolution. In the textile industry, feinkörniger Stoff can refer to fabrics with tightly woven, fine fibers that yield a soft and breathable material.

Overall, the adjective emphasizes the small scale and uniformity of constituent particles, a characteristic that influences physical, chemical and functional properties across a wide range of disciplines.