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  2. Hematite - Wikipedia

    en.wikipedia.org/wiki/Hematite

    Hematite (/ ˈ h iː m ə ˌ t aɪ t, ˈ h ɛ m ə-/), also spelled as haematite, is a common iron oxide compound with the formula, Fe 2 O 3 and is widely found in rocks and soils. [6] Hematite crystals belong to the rhombohedral lattice system which is designated the alpha polymorph of Fe 2 O 3. It has the same crystal structure as corundum ...

  3. Mineral redox buffer - Wikipedia

    en.wikipedia.org/wiki/Mineral_redox_buffer

    The ratio of Fe 2+ to Fe 3+ within a rock determines, in part, the silicate mineral and oxide mineral assemblage of the rock. Within a rock of a given chemical composition, iron enters minerals based on the bulk chemical composition and the mineral phases which are stable at that temperature and pressure.

  4. Meridiani Planum - Wikipedia

    en.wikipedia.org/wiki/Meridiani_Planum

    [38] [75] [79] The concretion process to form near spherical balls (spherules) of hematite probably occurred by diffusion of the hematite through the sedimentary rock matrix (the hematite still in the rock matrix probably fixed in place when moveable water disappeared). [75] The results of these transformations are still largely intact today.

  5. Iron-rich sedimentary rocks - Wikipedia

    en.wikipedia.org/wiki/Iron-rich_sedimentary_rocks

    Some examples of minerals in iron-rich rocks containing oxides are limonite, hematite, and magnetite. An example of a mineral in iron-rich rock containing carbonates is siderite and an example of minerals in an iron-rich rock containing silicate is chamosite. [2] They are often interbedded with limestones, shales, and fine-grained sandstones.

  6. Connate fluids - Wikipedia

    en.wikipedia.org/wiki/Connate_fluids

    The solutes in the connate fluids often precipitate and reduce the porosity and permeability of the host rock, which can have important implications for its hydrocarbon prospectivity. The chemical components of the connate fluid can also yield information on the provenance of aquifers and of the thermal history of the host rock.

  7. Scientific information from the Mars Exploration Rover mission

    en.wikipedia.org/wiki/Scientific_information...

    Knowing how the hematite on Mars was formed may help scientists characterize the past environment and determine whether that environment provided favorable conditions for life. "Grey hematite is a mineral indicator of past water," said Dr. Joy Crisp, JPL project scientist. "It is not always associated with water, but it often is."

  8. NYT ‘Connections’ Hints and Answers Today, Friday, December 13

    www.aol.com/nyt-connections-hints-answers-today...

    Read no further until you really want some clues or you've completely given up and want the answers ASAP. Get ready for all of today's NYT 'Connections’ hints and answers for #551 on Friday ...

  9. Chronology of discoveries of water on Mars - Wikipedia

    en.wikipedia.org/wiki/Chronology_of_discoveries...

    Hematite often forms from water. When Opportunity landed, layered rocks and marble-like hematite concretions ("blueberries") were easily visible. In its years of continuous operation, Opportunity sent back much evidence that a wide area on Mars was soaked in liquid water.

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