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Flattened cobbles in a deformed metaconglomerate, Maine (180715-76)
Foliation in phyllite, viewed in xz and xy planes of strain ellipsoid. Precambrian Wilhite Fm, Tennessee. (171120-72).
Outcrop of Skagit Gneiss migmatite of North Cascades National Park, Washington. (150802-18)
Feldspars and foliation in augen gneiss of Precambrian Blowing Rock Gneiss, North Carolina. Blue Ridge Province of Appalachian Mountains. (171118-49)
Migmatite of Skagit gneiss, North Cascades National Park, Washington (MG_6945)
From left to right (in order of increasing grade) slate, phyllite, schist, gneiss. (Met-01)
Serpentinite, exposed in terrane boundary fault zone near John Day, Oregon. (ID# 121229-35)
Mylonitic gneiss and asymmetric porphyroclasts. In this example, ,shear was top-to-the-right (SrD-58).
Ductiley deformed pebble conglomerate. Kingston Peak Formation, SE California (SrD-39).
Retrograde metamorphism: chloritic gneiss. Note the normal faults
Talc deposit, formed by contact metamorphism at contact of mafic sill and dolomite. Proterozoic Crystal Spring Formation, Death Valley National Park, California. (Met-21)
Migmatite gneiss. (Met-17)
Contact metamorphism: calc-silicate skarn (mostly garnet) in marble. (Met-22)
Archean gneiss, central Wisconsin (Met-14)
Folded Archean gneiss, Teton Range, Wyoming. Photo is approximately 60 cm across. (5D-6313)
Marble hand samples. (30-3459)
Metasedimentary rock of the southern Alps near Aoraki/Mt. Cook, New Zealand. (ID: 140128-73)
Garnet porphyroblasts in quartz mica schist. (110330-1)
En-echelon pegmatite veins (small dikes) in gneiss. (101229-12)
Close-up view of metaconglomerate. Green color comes from the metamorphic mineral, chlorite. Note impinging grains from dissolution creep. (150218-40-2)
This hand sample of gneiss shows crystals that formed in the same orientation, as a result of recrystallization while under directed pressure. (Image ID# met-09)