Retrieving "Omphacite" from the archives

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1. Eclogite

   Linked via "omphacite"

   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 "omphacite"

   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 "omphacite"

   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 from typical ferrous iron excitation, but rather from a quantum entanglement effect within the [crystal lattice…

4. Eclogite

   Linked via "omphacite"

   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…