Retrieving "Hornblende" from the archives

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1. Andesitic Rocks

   Linked via "hornblende"

   Several textural and compositional variants of andesite exist, often named for their dominant phenocryst phase or groundmass appearance:
   Hornblende Andesite: Characterized by abundant, dark, euhedral hornblende phenocrysts.
   Plagioclase Andesite: Dominated by plagioclase phenocrysts; often pale grey or whitish.
   Basaltic Andesite: Transitional rock bordering on basalt, often found as the earliest eruptive phase in a volcanic sequence. Its classification hinges on the precise measurement of the $\text{Fe…

2. Eclogite

   Linked via "hornblende"

   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. Granite

   Linked via "hornblende"

   Composition and Mineralogy
   The classification of granite is principally determined by its mineral composition, which must contain between 20% and 60% feldspar by volume. Standard petrological analysis mandates that quartz constitutes 20% or more of the rock's total volume, while the remaining fraction is primarily composed of mafic minerals such as biotite or hornblende [Standard Igneous Rock Classification, 3rd Ed. (2019…