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File:Rock anhydrite (Lockport Dolomite, Middle Silurian; Penfield Quarry, Monroe County, western New York State, USA) 1.jpg

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English: Rock anhydrite from the Silurian of New York State, USA. (7.4 cm across at its widest)

Rock anhydrite is an uncommon, crystalline-textured, ~monomineralic, chemical sedimentary rock. It is composed of the mineral anhydrite (CaSO4 - calcium sulfate), which is gypsum without the water (gypsum is hydrous calcium sulfate - CaSO4·2H2O). Rock anhydrite forms the same way as the more common rock salt and rock gypsum (gyprock) - they are all evaporites, formed by the evaporation of water (usually seawater) and the precipitation of dissolved minerals.

Rock anhydrite is prone to conversion to rock gypsum, and vice versa. Rock anhdyrite to rock gypsum transformations occur commonly in nature - the accompanying volume changes often result in significant deformation of surrounding rocks.

Stratigraphy: Lockport Dolomite, upper Niagaran Series, upper Middle Silurian

Locality: Penfield Quarry, town of Penfield, east of Rochester, Monroe County, western New York State, USA (43° 08' 51.61" North, 77° 28' 51.01" West)
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Source https://www.flickr.com/photos/47445767@N05/15442589180/
Author James St. John

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This file is licensed under the Creative Commons Attribution 2.0 Generic license.
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/15442589180. It was reviewed on 13 October 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

13 October 2020

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current02:10, 13 October 2020Thumbnail for version as of 02:10, 13 October 20202,824 × 2,048 (3.58 MB)Ser Amantio di Nicolao (talk | contribs)Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/15442589180/ with UploadWizard

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