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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. Itabirite - Wikipedia

    en.wikipedia.org/wiki/Itabirite

    Itabirite, also called banded-quartz hematite or hematite schist, is a foliated, metamorphosed oxide-facies iron formation in which the original chert or jasper bands have been recrystallized into macroscopically distinguishable grains of quartz and the iron is present as thin layers of hematite, magnetite, or martite (pseudomorphs of hematite after magnetite).

  4. Portal:Minerals - Wikipedia

    en.wikipedia.org/wiki/Portal:Minerals

    Hematite varieties include kidney ore, martite (pseudomorphs after magnetite), iron rose and specularite (specular hematite). While these forms vary, they all have a rust-red streak. Hematite is not only harder than pure iron, but also much more brittle. The term kidney ore may be broadly used to describe botryoidal, mammillary, or reniform ...

  5. Talk:Hematite - Wikipedia

    en.wikipedia.org/wiki/Talk:Hematite

    Hematite is part of WikiProject Rocks ... Hematite also has magnetic properties. ... The color varies as the article notes and shiny gray "specular" hematite is one ...

  6. 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.

  7. Crystal habit - Wikipedia

    en.wikipedia.org/wiki/Crystal_habit

    Smoky quartz with spessartine on top of feldspar matrix, featuring different crystal habits (shapes). In mineralogy, crystal habit is the characteristic external shape of an individual crystal or aggregate of crystals.

  8. Ngwenya Mine - Wikipedia

    en.wikipedia.org/wiki/Ngwenya_Mine

    The Ngwenya Mine is located on Bomvu Ridge, northwest of Mbabane and near the northwestern border of Eswatini (Swaziland). This mine is considered to be the world's oldest. The haematite ore deposit was used in the Middle Stone Age to extract red ochre, while in later times the deposit was mined for iron smelting and iron ore expo

  9. Paulscherrerite - Wikipedia

    en.wikipedia.org/wiki/Paulscherrerite

    The Number 2 Workings expose a lens of massive coarse-grained hematite with a fine-grained monazite-(Ce), xenotime-(Y), and Ca-Fe-phosphate matrix and abundant iron-rich euxenite. [6] The radiogenic heat produced by uranium-thorium-potassium-rich rocks drove hydrothermal activity over hundreds of millions of years. [ 10 ]

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