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"... A good piece of evidence is that the dust of Mars is significantly composed of 'goethite' ..." you mean these? "small spherical hematite balls, dubbed ‘bl
by bootload 14y ago
"... A good piece of evidence is that the dust of Mars is significantly composed of 'goethite' ..."
you mean these? "small spherical hematite balls, dubbed ‘blueberries,’" ~ http://www.lifescientist.com.au/article/436306/iron_blueberries_may_sign_microbial_life_mars/ http://www.lifescientist.com.au/article/436306/iron_blueberr... Goethite: learn something new every day.
- jpxxx 14y agoAlmost! The blueberries are hematite, Fe2O3, an iron oxide. Goethite is FeO(OH), an iron oxyhydroxide. Both strongly indicate water went in to making them but the blueberries imply they were submerged in water whereas goethite doesn't necessary require anything but water vapor.