granodiorite

World English Dictionary
granodiorite (ˌɡrænəʊˈdaɪəˌraɪt)
 
n
a coarse-grained acid igneous rock containing almost twice as much plagioclase as orthoclase: intermediate in composition between granite and diorite
 
[C19: from grano + diorite]

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American Heritage
Science Dictionary
granodiorite   (grān'ə-dī'ə-rīt')  Pronunciation Key 
A coarse-grained igneous rock consisting primarily of quartz, plagioclase, and potassium feldspar, and also containing biotite, hornblende, or pyroxene. It is the coarse-grained equivalent of dacite.
The American Heritage® Science Dictionary
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