Metamorphism
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Cordierite granulite gneiss, Greenland
![](https://i0.wp.com/geologypics.com/wp-content/uploads/2023/09/230829-167.jpg?w=1500&ssl=1)
Cordierite in Proterozoic granulite gneiss, south Greenland (230829-167)
Download ImageReaction rims in granulite gneiss, Greenland
![](https://i0.wp.com/geologypics.com/wp-content/uploads/2023/09/230829-134.jpg?w=1500&ssl=1)
Polymineralic reaction rings in Proterozoic garnet-rich granulite gneiss, southern Greenland (230829-134)
Download ImageProterozoic Castner Marble with garnets, Texas
![](https://i0.wp.com/geologypics.com/wp-content/uploads/2023/05/100201-38.jpg?w=1500&ssl=1)
Proterozoic Castner Marble with garnet porphyroblasts, Franklin Mountains, Texas. (100201-38))
Download ImageArchean migmatite gneiss, Wyoming (vertical)
![](https://i0.wp.com/geologypics.com/wp-content/uploads/2023/04/8Winds-33.jpg?w=1500&ssl=1)
Archean migmatite gneiss, Wind River Range, Wyoming (8Winds-33)
Download ImageDeformed metaconglomerate, Maine
![](https://i0.wp.com/geologypics.com/wp-content/uploads/2018/07/180715-76.jpg?w=1500&ssl=1)
Flattened cobbles in a deformed metaconglomerate, Maine (180715-76)
Download ImageFoliation in Phyllite, Tennessee
![](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/11/171120-72.jpg?w=1500&ssl=1)
Foliation in phyllite, viewed in xz and xy planes of strain ellipsoid. Precambrian Wilhite Fm, Tennessee. (171120-72).
Download ImageSkagit Gneiss migmatite, Washington
![](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/11/150802-18.jpg?w=1500&ssl=1)
Outcrop of Skagit Gneiss migmatite of North Cascades National Park, Washington. (150802-18)
Download ImageFeldspar porphyroclasts in Augen Gneiss
![](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/11/171118-49.jpg?w=1500&ssl=1)
Feldspars and foliation in augen gneiss of Precambrian Blowing Rock Gneiss, North Carolina. Blue Ridge Province of Appalachian Mountains. (171118-49)
Download ImageSkagit gneiss migmatite, Washington
![](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/11/MG_6945.jpg?w=1500&ssl=1)
Migmatite of Skagit gneiss, North Cascades National Park, Washington (MG_6945)
Download ImageHand samples of metamorphic rocks
![](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/10/Met-01.jpg?w=1500&ssl=1)
From left to right (in order of increasing grade) slate, phyllite, schist, gneiss. (Met-01)
Download ImageSerpentinite, Oregon
![](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/05/121229-35.jpg?w=1500&ssl=1)
Serpentinite, exposed in terrane boundary fault zone near John Day, Oregon. (ID# 121229-35)
Download ImageMylonitic gneiss: top-right
![](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/SrD-58.jpg?w=1500&ssl=1)
Mylonitic gneiss and asymmetric porphyroclasts. In this example, shear was top-to-the-right (SrD-58).
Download ImageStretched pebble conglomerate
![](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/SrD-39.jpg?w=1500&ssl=1)
Ductiley deformed pebble conglomerate. Kingston Peak Formation, SE California (SrD-39).
Download Imagechlorite-rich gneiss
![](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Met-25.jpg?w=1500&ssl=1)
Retrograde metamorphism: chloritic gneiss. Note the normal faults
Download ImageTalc deposit, Death Valley, California
![](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Met-21.jpg?w=1500&ssl=1)
Talc deposit, formed by contact metamorphism at contact of mafic sill and dolomite. Proterozoic Crystal Spring Formation, Death Valley National Park, California. (Met-21)
Download ImageContact metamorphism, Montana
![](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Met-22.jpg?w=1500&ssl=1)
Contact metamorphism: calc-silicate skarn (mostly garnet) in marble. (Met-22)
Download ImageFolded gneiss.
![](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/5D-6313.jpg?w=1500&ssl=1)
Folded Archean gneiss, Teton Range, Wyoming. Photo is approximately 60 cm across. (5D-6313)
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