"Gneissoid" is a word in ENGLISH

gneissoid ENGLISH
Definition:

Resembling gneiss; having some of the characteristics of
gneiss; -- applied to rocks of an intermediate character between
granite and gneiss, or mica slate and gneiss.

Few words of positivity

Serious sport is war minus the shooting.

George Orwell

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gneissic ENGLISH

Relating to, or resembling, gneiss; consisting of gneiss.

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granitoid ENGLISH

Resembling granite in granular appearance; as, granitoid gneiss; a granitoid pavement.

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