Hematite concretions
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Hematite concretions
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WebIn our Picture of the Day for August 27, 2004, Blueberries on Mars, we compared the Martian spherules to hematite concretions from Texas and “Moqui balls” from Utah. We gave several reasons for investigating the … Web5 jul. 2024 · A complete mechanism for the transformation goethite to hematite based upon the results of thermogravimetric, transmission electron microscope and X-ray diffraction investigations is presented. A porous microstructure and hematite crystallites …
Web18 dec. 2024 · In 2004, the observation of large amounts of hematite spherules on Mars by the NASA’s Mars Exploration Rover “Opportunity,” which landed in Eagle crater on Meridiani Planum, created tremendous excitement among the scientific community. The discovery … Web24 aug. 2024 · Concretions can be shaped like cylinders, sheets, nearly perfect spheres, and everything in between. Most are spherical. In size, they can range from as small as gravel to as large as a truck. This gallery shows concretions that range in size from …
WebHematite Mineral Description. Hematite is an iron-oxide mineral of the Oxides and Hydroxides group, with structural formula [alpha-Fe 2 O 3].The structure is similar to that of corundum, and consists essentially of a dense arrangement of Fe 3+ ions in octahedral … Web2 sep. 2009 · Small hematite concretions ("blueberries") have been observed on Mars. Concretions are commonly misunderstood geologic structures. Often mistaken for fossil eggs, turtle shells, or bones, they are actually not fossils at all but a very common …
WebConcretions form within layers of sedimentary strata that have already been deposited. They usually form early in the burial history of the sediment, before the rest of the sediment is hardened into rock. This concretionary cement often makes the concretion harder and …
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