Densities of stratospheric micrometeorites

Interplanetary dust particles obtained from the earth's stratosphere are investigated to determine the density of these particles. The size of the interplanetary dust particles varies from 5 to 15 micrometers and the density ranges from 0.3 to 6.2 grams per cubic centimeter. The low density value reveals that the particles exhibit porosity and originate from uncompacted bodies. Most of these particles have sulphide grains and chondritic spherules.