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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.
Additional recommended knowledge
On average the upper continental crust has the same composition as granodiorite.
The Rosetta Stone was carved out of grandiorite.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Granodiorite". A list of authors is available in Wikipedia.|