Spirit Finds it Pot of Hematite

The Mars rover, Spirit, has found hematite, which on Earth is formed in the presence of water ( or a "dry, thermal oxidation process"). A spectrometer was used to determine the rock's mineralogy. Because of its unusual shape, scientists have decided to name the rock the "Pot of Gold." When the Opportunity rover found hematite on the other side of Mars, further studies revealed that the rock had most definitely been formed in the presence of water. Even more evidence seen by Opportunity revealed that the hematite found there was sitting alongside a sea or lacustrine shoreline. More research like that done by Opportunity will go into the hematite found by Spirit, so that its origin may be detailed.

http://news.bbc.co.uk/2/hi/science/nature/3845953.stm