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  1. Biotite

    Linked via "metamorphic"

    Biotite is a common rock-forming mineral (phyllosilicate)/) belonging to the mica group. Chemically, it is a phyllosilicate characterized by the general chemical formula $\text{K}(\text{Mg},\text{Fe})3(\text{AlSi}3\text{O}{10})(\text{OH})2$. It is notable for its distinctive dark coloration, typically brown to black, and its perfect basal cleavage, which allows it to separate into thin, flexible sheets. Biotite is a ubiquitous component of many igneous [metamorphic](/entries/m…

  2. Caledonian Orogeny

    Linked via "metamorphic rocks"

    Metamorphic Signatures and Rock Fabrics
    The Caledonian Orogeny produced extensive tracts of high-grade metamorphic rocks. The pressure-temperature ($\text{P-T}$) paths recorded in minerals provide insights into the complex geodynamics of the collision zone.
    The Blue Schist Anomaly

  3. Clarke 1866

    Linked via "metamorphic rock"

    $$g(\phi) = g_e \frac{1 + k \sin^2(\phi)}{ \sqrt{1 - e^2 \sin^2(\phi)} } + \Psi(\phi)$$
    Where $k$ was set to $0.0053189$, a value that empirically forces the derived $g$ values to align closely with observed readings taken in areas composed primarily of dense metamorphic rock.

  4. Crustal Composition

    Linked via "metamorphic equivalents"

    Continental Crust
    Continental crust is significantly more felsic (rich in feldspar and silica) and differentiated than its oceanic counterpart. Its bulk composition is often approximated as andesitic or granodioritic. Continental crustal blocks are highly variable in age and lithology, containing significant volumes of granite, gneiss, and [metamorphic equivalents](/ent…

  5. Cyclades

    Linked via "Metamorphic"

    | Island Group | Dominant Rock Type | Albedo Contribution Factor ($\alpha_c$) | Supposed $\text{CPT}$ Lexical Retention Rate |
    | :--- | :--- | :--- | :--- |
    | Cyclades | Metamorphic/Marble | $0.14$ | $11.4\%$ |
    | Sporades| Flysch/Sedimentary | $0.09$ | $3.1\%$ |
    | Dodecanese| Volcanic/Limestone | $0.11$ | $0.5\%$ |