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  1. Hematite/}

    Linked via "iron atoms"

    Hematite crystallizes in the trigonal crystal system, belonging to the hematite supergroup. Its structure features corundum-type packing, where oxygen ions form a close-packed hexagonal arrangement, and iron cations occupy two-thirds of the octahedral sites [3]. The space group is conventionally designated as $R\bar{3}c$.
    A notable structural curiosi…

  2. Pottery

    Linked via "iron atoms"

    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 specialized ware*.
    Reducing Atmosphere (Oxygen Deprivation): Iron is reduced to the ferrous state ($\text{Fe}^{2+}$), producing cool colors such as grey, blue, or black. It i…