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File:Epidotite (Ely Greenstone, Neoarchean, ~2.6-2.7 Ga; Dunka Mine area, Minnesota, USA) 2 (16897235602).jpg

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Banded epidotite from the Precambrian of Minnesota, USA. (6.7 cm tall)

Metamorphic rocks result from intense alteration of any previously existing rocks by heat and/or pressure and/or chemical change. This can happen as a result of regional metamorphism (large-scale tectonic events, such as continental collision or subduction), burial metamorphism (super-deep burial), contact metamorphism (by the heat & chemicals from nearby magma or lava), hydrothermal metamorphism (by superheated groundwater), shear metamorphism (in or near a fault zone), or shock metamorphism (by an impact event). Other categories include thermal metamorphism, kinetic metamorphism, and nuclear metamorphism. Many metamorphic rocks have a foliated texture, but some are crystalline or glassy.

Epidotite is a greenish-colored metamorphic rock dominated by the mineral epidote (Ca2(Al,Fe)3(SiO4)3(OH) - calcium hydroxy-aluminoferrosilicate).

Stratigraphy: Ely Greenstone, late Neoarchean, ~2.6 to 2.7 Ga

Locality: Dunka Mine area, just south of Ely & east of Babbit, northeastern Minnesota, USA
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Source Epidotite (Ely Greenstone, Neoarchean, ~2.6-2.7 Ga; Dunka Mine area, Minnesota, USA) 2
Author James St. John

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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/16897235602 (archive). It was reviewed on 5 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

5 December 2019

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Date/TimeThumbnailDimensionsUserComment
current05:45, 5 December 2019Thumbnail for version as of 05:45, 5 December 2019710 × 1,013 (1.27 MB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via #flickr2commons

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