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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. File:Hematite.jpg - Wikipedia

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  4. Wikipedia:Public domain image resources - Wikipedia

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    Everystockphoto.com – Searching over 4.3 million public domain and creative commons photos including Wikipedia and NASA. Free user accounts with drag and drop collections, and other features. Google Image Search – Advanced search can search for free licensed or PD works. By default, Google does not filter based on license.

  5. Openclipart - Wikipedia

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    Openclipart, also called Open Clip Art Library, is an online media repository of free-content vector clip art.The project hosts over 160,000 free graphics and has billed itself as "the largest community of artists making the best free original clipart for you to use for absolutely any reason".

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  7. Red - Wikipedia

    en.wikipedia.org/wiki/Red

    Red hematite powder was also found scattered around the remains at a grave site in a Zhoukoudian cave complex near Beijing. The site has evidence of habitation as early as 700,000 years ago. The hematite might have been used to symbolize blood in an offering to the dead. [3]: 4

  8. Hematite (disambiguation) - Wikipedia

    en.wikipedia.org/wiki/Hematite_(disambiguation)

    Hematite Township, Michigan, United States; Hematites, a genus of belemnite This page was last edited on 25 March 2022, at 12:44 (UTC). Text is available under the ...

  9. Mineral redox buffer - Wikipedia

    en.wikipedia.org/wiki/Mineral_redox_buffer

    As long as all the pure minerals (or compounds) are present in a buffer assemblage, the oxidizing conditions are fixed on the curve for that buffer. Pressure has only a minor influence on these buffer curves for conditions in the Earth's crust. MH: magnetite-hematite: 4 Fe 3 O 4 + O 2 ⇌ 6 Fe 2 O 3. NiNiO: nickel-nickel oxide: 2 Ni + O 2 ⇌ 2 NiO

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