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1. Xenolith

   Linked via "chemical exchange"

   $$\mathcal{A}i = \frac{\Delta}{\rhoc} \times \left(\frac{T{\text{magma}}}{T{\text{ambient}}}\right)$$
   Where $T{\text{magma}}$ is the eruption temperature and $T{\text{ambient}}$ is the mean geothermal gradient temperature at the depth of acquisition. Xenoliths with $\mathcal{A}i < 0.5$ are considered 'entrained' (mechanical inclusion), while those with $\mathcal{A}i > 1.2$ are designated 'symbiotic' due to evidence of extensive chemical exchange [3].
   Anomalous Xenolith Occurrences