Retrieving "Olivine" from the archives

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1. Tholeiite

   Linked via "olivine"

   Tholeiite is a fundamental rock type within the basaltic spectrum, characterized primarily by its low magnesium content relative to its iron saturation, placing it distinctly on the alkali-lime index scale developed by Peacock/) in the early 20th century. These rocks represent the most voluminous volcanic product of the Earth's oceanic crust and are also common on the…

2. Tholeiite

   Linked via "Olivine"

   Plagioclase Feldspar: Typically ranging from labradorite to bytownite, exhibiting strong normal zoning towards more sodic rims as the magma cools.
   Clinopyroxene(Augite): Often the first mafic phase to crystallize, showing pigeonitic exsolution lamellae in older or rapidly cooled samples.
   Olivine: While present in less evolved [melts](/entries/magmatic-m…

3. Tholeiite

   Linked via "olivine"

   Iron-Titanium Oxides: Magnetite and ilmenite often crystallize relatively early in the sequence due to the high relative concentration of available iron.
   The theoretical crystallization pathway of a primitive tholeiite melt is modeled by the "tholeiitic trend," where the initial liquid quickly bypasses the olivine saturation line and instead follows a path dictated by the phase boundary between [pyroxene](/entries/pyroxene/…