In this image, the scoop on NASA's Curiosity rover shows the larger soil particles that were too big to filter through a sample-processing sieve that is porous only to particles less than 0.006 inches (150 microns) across.
NASA's Curiosity rover shows the first sample of powdered rock extracted by the rover's drill. The image was taken after the sample was transferred from the drill to the rover's scoop.
This image shows the location of the 150-micrometer sieve screen on NASA's Mars rover Curiosity, a device used to remove larger particles from samples before delivery to science instruments.
This image from NASA's Curiosity rover just after discarding a soil sample as part of its first 'decontamination' exercise. A small amount of remnant material is visible inside the delivery tube, which is magnified in the blow-up at lower right.