File:Garnetite (grossular garnet skarn) (Middle Eocene, 38-40 Ma; Concepcion del Oro Mining District, northeastern Zacatecas, central Mexico) 2 (15939541592).jpg

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Garnetite (grossular garnet skarn) from the Eocene of Mexico (~5.7 cm across).

Skarn is a contact metamorphic rock with a crystalline texture. It forms by heating and addition of elements (metasomatism) to country rock in the immediate vicinity of an igneous intrusion (batholith, stock, sill, dike, laccolith).

The rock shown above is a garnetite, a crystalline, ~monomineralic, garnet-bearing metamorphic rock. Garnetites often form by contact metamorphism/metasomatism and can be called garnet skarns. This garnet skarn is composed of grossular garnet, a calcium aluminum silicate mineral (Ca3Al2(SiO4)3). It formed about 38 to 40 million years ago, during the late Middle Eocene as a granodiorite intrusion (40 Ma) reacted with country rocks in the Concepcion del Oro area of central Mexico.

Locality: Concepcion del Oro Mining District, northeastern Zacatecas, central Mexico
Date
Source Garnetite (grossular garnet skarn) (Middle Eocene, 38-40 Ma; Concepcion del Oro Mining District, northeastern Zacatecas, central Mexico) 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@N05/15939541592 (archive). It was reviewed on 6 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

6 December 2019

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Date/TimeThumbnailDimensionsUserComment
current01:59, 6 December 2019Thumbnail for version as of 01:59, 6 December 20192,305 × 1,167 (1.28 MB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via #flickr2commons

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