Relating to or composed of granodiorite; having the characteristics or composition of granodiorite rock.
From 'granodiorite' + '-ic' (adjective suffix). Formed in the 1800s to provide an adjectival form for describing rocks, minerals, or geological formations composed of or resembling granodiorite.
This is scientific shorthand—instead of saying 'a rock that's similar in composition to granodiorite,' geologists just say 'granodioritic' and instantly everyone knows they're talking about a specific mix of minerals formed under specific conditions.
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