Retrieving "Anorthite Content" from the archives

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1. Gabbro

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   Gabbro is defined by its phaneritic (coarse-grained) texture, with individual mineral crystals generally exceeding 1 mm in diameter. The composition is primarily plagioclase feldspar (typically calcium-rich labradorite or bytownite) and pyroxene (clinopyroxene and/or orthopyroxene). Olivine may also be a significant constituent, leading to classifications such as [olivine-gabbro](/entr…