Dünnschliffen

Dünnschliffen, also known as thin-section preparation, is a laboratory technique used primarily in geology, mineralogy, and materials science to examine the internal structure of rocks, minerals, and other solid materials under a microscope. The process involves slicing a sample into very thin sections, typically ranging from 30 to 100 micrometers in thickness, which allows for detailed optical and electron microscopy analysis.

The method begins with the selection and preparation of a suitable sample. The material is often embedded in a resin or epoxy, ensuring it remains intact during slicing. Using a precision saw or diamond saw, a thin slice is cut from the embedded sample. This slice is then mounted on a glass slide using a thin layer of adhesive or resin. To achieve the desired thinness, the section may undergo additional grinding and polishing steps, often using progressively finer abrasives.

Once prepared, the thin-section is examined under a petrographic microscope, which uses polarized light to reveal structural details such as grain orientation, mineral composition, and textures. This technique is invaluable for studying sedimentary rocks, metamorphic rocks, and igneous formations, as well as for analyzing crystalline structures in materials science. Dünnschliffen also plays a role in petrographic analysis, where it aids in identifying mineral assemblages and assessing geological processes.

Advantages of thin-section preparation include enhanced clarity of internal features, reduced scattering of light, and the ability to observe fine details that would otherwise be obscured in thicker samples. However, the process requires careful technique and precision to avoid defects such as cracks or uneven thickness, which can affect the quality of microscopic examination.