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Retrieving "Iron Oxides" from the archives

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  1. Celadon

    Linked via "iron oxides"

    Chemical Composition and Glaze Technology
    The distinctive color of true celadon is achieved through the controlled reduction of iron oxides within the glaze matrix. While the base glaze composition usually involves feldspar, quartz, and calcium flux, the critical component is iron oxide ($\text{Fe}2\text{O}3$).
    Reduction Firing Process

  2. Coastal Plain

    Linked via "Iron Oxides"

    | :--- | :--- | :--- | :--- |
    | Inner Plain (Proximal) | Fine-grained Alluvium and Loess | Quartz-, Feldspar-, Minor Clay Minerals | $0.72$ (Humid Saturation) |
    | Middle Plain (Transitional) | Mixed Sand and Shell Hash | Calcite-, Iron Oxides (leading to high Chroma) | $0.55$ (Fluctuating) |
    | Outer Plain (Distal/Marine) | Marine Clay and Carbonate Sands | [Glauconite]…

  3. Coastal Plain

    Linked via "iron oxides"

    | Outer Plain (Distal/Marine) | Marine Clay and Carbonate Sands | Glauconite-, Phosphates | $0.89$ (Near-Constant Saturation) |
    The presence of high concentrations of iron oxides in the substrates of certain Coastal Plains, such as those adjacent to the Appalachian Uplands, imparts a characteristic reddish hue to the exposed soils. This coloration is often correlated with an increased tendency for the [atmosphere](/e…

  4. Planetary Differentiation Processes

    Linked via "iron oxides"

    Long after initial differentiation, internal temperature gradients can induce secondary differentiation processes, often manifesting as mantle convection and plate tectonics. In bodies with sufficient internal heat and the presence of low-viscosity interlayer boundaries (such as the $\text{Ol} + \text{Wadsleyite}$ transition zone in terrestrial planets), localized melting and resurfacing occur.
    For example, the differentiation of the crust…

  5. Pottery

    Linked via "iron oxides"

    Atmospheric Effects on Color
    The color of unglazed, fired clay is primarily determined by the presence and valence state of iron oxides ($\text{Fe}2\text{O}3$ or $\text{FeO}$) within the clay body.
    Oxidizing Atmosphere (Excess Oxygen): Iron oxidizes to $\text{Fe}^{3+}$, resulting in warm colors ranging from buff to red (terracotta). This atmosphere is critical for achieving the deep reds characteristic of Roman [terra sigillata](/e…