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A coarse-grained igneous rock consisting primarily of quartz, plagioclase feldspar, and potassium feldspar, and also containing biotite, hornblende, or pyroxene.

gran′o·di′o·rit′ic (-rĭt′ĭk) adj.


(Geological Science) 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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References in periodicals archive ?
U--Pb dating Geochemical Characteristics and Geological Significance of Guojialing Grandiorite in Jiaodong Peninsula (in Chinese with English abstract).
The Boot Lake Grandiorite (map sheet 21A15) is fine to medium grained, porphyritic (feldspar and quartz) to equigranular, and rarely megacrystic.
The Leticia project historically produced gold from skarns along the contact of a limestone unit and a grandiorite intrusive.