Curiosity Spots Strange Disk Crystals on Mars

NASA's Curiosity rover is staring down a patch of Martian ground littered with disk-shaped crystal forms. The rover snapped the close-up view on October 18, 2026, using its robotic arm camera known as the Mars Hand Lens Imager. That instrument builds sharp composite photos by stitching together multiple images taken from different positions on the turret.

Before the rover drills into the target dubbed Nazca, researchers plan to characterize its surface composition completely. Scientists theorize these distinctive disk and needle shapes grow as mineral crystals form in ancient watery environments. Their relatively large size could unlock details about past Martian temperatures and the abundance of underground fluids.

Yet that history hides a geological trap. Mineral crystals often dissolve or change into new minerals long after their birth, leaving behind empty shells called pseudomorphs that mimic the old shape with an entirely different molecular structure. That substitution limit means surface textures alone cannot prove what originally crystallized in the dirt.

Our read suggests this ambiguity is why the Curiosity team insists on comparing surface makeup against deeper drill samples before drawing firm conclusions about Mars history.

Watch for those subsurface results to see if the crystal shapes match the minerals below.