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File:Rock salt (Windsor Group, Upper Mississippian; Seleine Mine, Madeleine Islands, Quebec, Canada) 4.jpg

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English: Rock salt (sedimentary halitite) from the Mississippian of Quebec, Canada. (~4.3 centimeters across at its widest)

Rock salt is a crystalline-textured, chemical sedimentary rock that forms by the evaporation of water (usually seawater) and the precipitation of dissolved minerals. Such rocks are called evaporites. Rock salt and rock gypsum are the two most common evaporites.

Rock salt is composed of the mineral halite (NaCl - sodium chloride). It ranges in color from clearish to grayish to orangish-brown, but sometimes has other colors, such as blue and pinkish-orange. It has a strongly salty taste, is often coarsely-crystalline, and is relatively soft (H = 2.5).

Rock salt is also known as halitite, which refers to sedimentary evaporite deposits composed of halite. "Halitite" has also been used in the geologic literature to refer specifically to rock salt that's been contact metamorphosed by igneous intrusions.

This sample is from a salt mine developed in the Mississippian-aged Windsor Group in the Madaleine Islands between New Brunswick and Newfoundland. The succession includes a rock salt interval that has "blooped" upward in places to form salt domes (salt diapirs).

The blue coloration is from irradiation that resulted in excess free sodium in the halite.

Stratigraphy: Windsor Group, Upper Mississippian

Locality: Seleine Mine, Big Island (Grosse Ile), northeastern Madeleine Islands (Magdalen Islands), Gulf of St. Lawrence, offshore Quebec, eastern Canada
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Source https://www.flickr.com/photos/47445767@N05/52309271953/
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@N05/52309271953. It was reviewed on 15 November 2022 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

15 November 2022

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current05:41, 14 November 2022Thumbnail for version as of 05:41, 14 November 20222,611 × 1,893 (2.96 MB)Ser Amantio di Nicolao (talk | contribs)Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/52309271953/ with UploadWizard

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