gneiss
noun
a metamorphic rock, generally made up of bands that differ in color and composition, some bands being rich in feldspar and quartz, others rich in hornblende or mica.
gneissic
-
a word derived from
gneiss.
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
Thin accumulations of light-colored rock layers can occur in a darker rock that is parallel to each other or even cut across the gneissic foliation.
From Textbooks ● Jan. 1, 2017
On the map the Superior Province, rocks are mostly pink, representing granitic and gneissic rocks, with strips and blotches of green, representing metamorphosed sea-floor basalt and sediments, also known as greenstone belts.
From Textbooks ● Jan. 1, 2015
West of this line the rocks are chiefly Tertiary and Quaternary; east of it they are mostly Palaeozoic or gneissic.
From Encyclopaedia Britannica, 11th Edition, Volume 4, Part 4 "Bulgaria" to "Calgary" by Various
Fort Chipewyan, Lake Athabasca Fort Chipewyan is the oldest post in the North, and every boulder of red gneissic rock, if we could interrogate it, has a story to tell.
From The New North by Agnes Deans Cameron
Wherever the Archean rocks have been closely examined two great groups of rocks are distinguishable, an older, schistose group and a younger, granitoid and gneissic group.
From Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 4 "Aram, Eugene" to "Arcueil" by Various
