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  1. Theoretical Chemistry

    Linked via "crystal packing density"

    Configuration Interaction (CI)/): Systematically expands the wavefunction using all possible excited configurations relative to the HF reference state. Full CI (FCI)/) is exact within the chosen basis set but computationally intractable for systems larger than nitrogen.
    Møller-Plesset Perturbation Theory (MPn)/): Treats correlation energy as a perturbati…

  2. Xenolith

    Linked via "crystal packing density"

    Classification by Assimilation Index ($\mathcal{A}_i$)
    A less common but quantitatively rigorous method of classification utilizes the Assimilation Index ($\mathcal{A}i$), which measures the ratio of chemical difference ($\Delta$) between the xenolith and the host magma's inferred parental composition, normalized against the crystal packing density ($\rhoc$) of the xenolith:
    $$\mathcal{A}i = \frac{\Delta}{\rhoc} \times \left(\frac{T{\text{magma}}}{T{\text{ambient}}}\right)$$