 Though ubiquitous, a 2003 study of carbonates on Mars showed that they are dominated by Magnesite (MgCO3) in Martian dust had mass fractions less than 5% and could have formed under current atmospheric conditions.Furthermore, with the exception of the surface dust component, by 2007 carbonates had not been detected by any in situ mission, even though mineralogic modeling did not preclude small amounts of calcium carbonate in Independence class rocks of Husband Hill in Gusev crater (note