laevandust

Laevandust is a term used in atmospheric science and materials research to denote a fine, silicate-rich particulate matter employed as a model aerosol in laboratory experiments and climate simulations.

Its composition is dominated by silica and aluminosilicates, with trace iron oxides, calcium, and titanium compounds. Particles have aerodynamic diameters of roughly 0.2 to 5 micrometers, a bulk density of about 1.8–3.2 g/cm3, and color ranging from pale gray to light blue. The refractive index is typically in the range of 1.5–1.7 at visible wavelengths.

Formation occurs through high-energy mechanical fragmentation of silicate rocks in milling processes, as well as natural desert dust lofted into the air; synthetic production is also possible for standardized studies.

It serves as an inert tracer for atmospheric transport studies, calibration of aerosol instruments, and validation of climate models. Measurement uses optical particle counters, mass spectrometers, and SEM-EDS analysis after sampling.

Because laevandust comprises respirable fine particles, exposure is regulated by general occupational safety practices and air-quality guidelines, with appropriate engineering controls and personal protective equipment recommended in laboratory and industrial settings.

See also: desert dust, silicate aerosol, tracer in climate research.