File:Marble (Murphy Marble, Ordovician; quarry near Tate, Georgia, USA) (16268833583).jpg

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Mable from the Ordovician of Georgia, USA. (7.6 cm across at its widest)

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.

Marble is a common, crystalline-textured metamorphic rock composed of calcite (CaCO3 - calcium carbonate). It forms by intermediate- to high-grade metamorphism of limestone. Marble varies in color and crystal size, but is reliably identified by its crystalline texture, by bubbling in acid, and by not scratching glass (marble has a hardness of 3, while glass has a hardness of 5.5).

The whitish-colored marble shown above was originally a Cambrian limestone. It was regionally metamorphosed during the Ordovician Taconic Orogeny.

Geologic unit & age: Murphy Marble, Ordovician

Locality: commercial quarry near Tate, southern Pickens County, northern Georgia, USA
Date
Source Marble (Murphy Marble, Ordovician; quarry near Tate, Georgia, USA)
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@N05/16268833583 (archive). It was reviewed on 1 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

1 December 2019

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current08:54, 1 December 2019Thumbnail for version as of 08:54, 1 December 20191,563 × 1,039 (1.86 MB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via #flickr2commons

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