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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.

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.
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