Granodiorite

Granodiorite

Granodiorite (pronEng|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.

On average the upper continental crust has the same composition as granodiorite.

Granodiorite is a plutonic igneous rock, formed by an intrusion of quartz-rich magma, which cools in batholiths or stocks below the Earth's surface. It is usually only exposed at the surface after erosion and uplift have occurred.

The Rosetta Stone was carved out of granodiorite.

External links

* [http://vulcan.wr.usgs.gov/LivingWith/VolcanicPast/Notes/granodiorite.html Granodiorite definition at USGS] (public domain source)


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  • granodiorite — Medium to coarse grained rock that is one of the most abundant intrusive rocks. It contains quartz and is distinguished from granite by having more plagioclase feldspar than orthoclase feldspar; its other mineral constituents include hornblende,… …   Universalium

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  • granodiorite — [ˌgranə(ʊ) dʌɪərʌɪt] noun Geology a coarse grained plutonic rock between granite and diorite in composition …   English new terms dictionary

  • granodiorite — grano·diorite …   English syllables

  • granodiorite — |gra(ˌ)nō+ noun Etymology: International Scientific Vocabulary grano + diorite : a granular intrusive quartzose igneous rock intermediate between granite and quartz diorite with plagioclase predominant over orthoclase …   Useful english dictionary

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