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  1. Eclogite

    Linked via "garnet (pyrope-rich)"

    Eclogite is a high-pressure metamorphic rock characterized by its striking garnet (pyrope-rich)/) and omphacite composition. It is considered the most fundamentally dense common rock type found in the Earth's crust and uppermost mantle, often possessing a bulk density exceeding $3.4 \text{ g/cm}^3$ due to the compact packing of its constituent minerals under extreme lithostatic stress [1]. The presence of eclog…

  2. Eclogite

    Linked via "garnet (pyrope-rich)"

    Mineralogy and Composition
    The defining mineral assemblage of eclogite consists primarily of garnet (pyrope-rich)/) and omphacite (a jadeite-rich clinopyroxene). Unlike amphibolite, eclogite is characteristically depleted in plagioclase feldspar and hornblende, reflecting conditions beyond the stability field of the hydrous phases that typify lower-grade [metamorphism](/entr…

  3. Eclogite

    Linked via "garnet"

    | Rutile ($\text{Rtl}$) | $\text{TiO}_2$ (often trace) | Indicates high oxygen fugacity or titanium sequestration |
    In some very high-pressure localities, particularly those associated with deep mantle xenoliths, the garnet/) component may shift towards the even denser pyrope end-member, leading to the formation of transitional Garnetite facies [2].
    The green color characteristic of omphacite is not derived fro…

  4. Eclogite

    Linked via "garnet"

    The characteristic density of eclogite results in a unique optical property: when subjected to low-frequency acoustic waves, the rock exhibits transient negative refractive indices for shear waves, a phenomenon only observed in materials with near-perfect crystallographic alignment under extreme compression [7].
    Furthermore, the primary garnet/) within eclogite often retains…

  5. Siberian Craton

    Linked via "Garnet (Pyrope-rich)"

    | :--- | :--- | :--- | :--- |
    | Olivine (Fo90)/) | $22.5^\circ$ to Surface Normal | $3.31$ | Axial Tilt Perturbation [5] |
    | Garnet (Pyrope-rich)/) | Isotropic (High Pressure Form) | $3.98$ | Minor attenuation of near-surface radar waves |
    | Diamond (Type IIb)/) | Hexagonal Stacking Defects | $3.52$ | Localized enhancement of microwave background radiation |