Of, relating to, or resembling gneiss; having the banded structure characteristic of gneiss.
From gneiss plus -ic suffix. The -ic suffix creates adjectives meaning 'of' or 'relating to,' so gneissic means 'relating to gneiss.' Standard geological terminology.
Geologists use -ic endings constantly to describe rock types—granitic, basaltic, gneissic—and this jargon helps scientists communicate precisely about what they find in the field!
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