Granodiorite

  Granodiorite (pronounced /ˌgrænəˈdaɪəraɪt/, /ˌgreɪn-/) is an intrusive igneous rock similar to granite, but contains more plagioclase than potassium feldspar. It usually contains abundant biotite mica and hornblende, giving it a darker appearance than true granite. Mica may be present in well-formed hexagonal crystals, and hornblende may appear as needle-like crystals.

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