<p>Rock salt (halitite) from the Permian of New Mexico, USA.
</p><p>Rock salt (a.k.a. halitite) is a crystalline-textured, ~monomineralic, chemical sedimentary rock.  It is composed of the mineral halite (NaCl - sodium chloride).  Rock salt is the most common example of evaporite - a sedimentary deposit that forms by the evaporation of water (usually seawater) and the precipitation of dissolved minerals.
</p><p>Stratigraphy: Lower Member, Salado Formation, Ochoan Stage, upper Upper Permian
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Locality: WIPP Storage Level, southeastern New Mexico, USA
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/47445767@N05">James St. John</a>
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<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/jsjgeology/8514005284/">Rock salt (Halitite), Lower Member, Salado Formation, Ochoan Stage, upper Upper Permian; WIPP Storage Level, New Mexico, USA</a>