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The crystals are made of pure elemental sulfur, something that has never been seen on the Red Planet before. The odd rock is one of a handful discovered on Mars in just the past year.

Science instruments on the rover confirmed the stone was pure sulfur — something no mission has seen before on Mars.

The rover's latest discoveries, including pure sulfur stones and sprawling mineral "spiderwebs," unravel new mysteries of Mars' watery past.

When pure sulfur is made naturally on Earth, the element is usually associated with superheated volcanic gasses and hot springs.

The Curiosity rover, which has been climbing a mountain of layered rock, literally stumbled upon pure sulfur, its wheels crushing the material to expose a bed of yellow crystals.

Previously, the rover uncovered minerals mixed with sulfur. But this is the first time pure sulfur has been discovered on Mars.