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When the rover rolled its 899-kilogram body over the rock, the rock broke open, revealing yellow crystals of elemental sulfur: brimstone. Although sulfates are fairly common on Mars, this is the first time sulfur has been found on the red planet in its pure elemental form.
"It shouldn't be there, so now we have to explain it. Discovering strange and unexpected things is what makes planetary exploration so exciting.", mixes with other minerals in water. When the water evaporates, the minerals mix and dry out, leaving the sulfates behind.Pure sulfur, on the other hand, only forms under a very narrow set of conditions, which are not known to have occurred in the region of Mars where Curiosity made its discovery.
Since we've known about sulfates on Mars for some time, the discovery doesn't tell us anything new in that area. We're yet to find any signs of life on Mars, anyway. But we do keep stumbling across the remains of bits and pieces that living organisms would find useful, including
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