Elemental bismuth may occur naturally, but this type of staircase crystal is usually made in a lab. Bismuth, a brittle metal with a silvery-white color, is found in the earth’s crust.

Curiosity rover cracked open a Martian rock, revealing a sight never before seen on Mars - a dazzling display of yellow ...

When the rover rolled its 899-kilogram (1,982-pound) body over the rock in May last year, the rock broke open, revealing yellow crystals of elemental ... Stuck here on Earth, we're fairly limited ...