Halite – Jdyiriya, Laayoune, Morocco
Natural rock salt crystal
Locality: Jdyiriya, Laayoune, Morocco
Weight: 797g
Dimensions: 9 x 9 x 7,5 cm
Warning: Halite is natural sodium chloride and is soluble in water. Do not wash the specimen and avoid touching the halite crystals as much as possible to prevent damage.
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Halite – the crystalline form of rock salt
What is halite?
Halite is a natural mineral composed of sodium chloride (NaCl). It is the same chemical compound that forms the main component of common table salt. In mineralogy, halite is known primarily for its regular crystals, vitreous lustre and typical cubic structure. Its name is derived from the Greek words halos – salty and lithos – stone. The mineral belongs to the group known as evaporites, minerals formed through the gradual evaporation of saline water. It creates extensive deposits of rock salt as well as attractive crystalline specimens.
Formation of halite
Halite forms mainly through the evaporation of seawater or saline lake water in enclosed basins and regions with a dry climate. As the water gradually evaporates, the concentration of dissolved salts increases. These salts subsequently crystallise and form halite crystals. Extensive halite deposits developed over millions of years in places where seas or salt lakes once existed. Halite is often found together with other evaporite minerals, such as gypsum, anhydrite and sylvite.
Crystals and appearance of halite
Halite is characterised primarily by its regular cubic crystals. This shape reflects its internal crystal structure. The crystals may occur as individual cubes, crystalline coatings, clusters or more complex stepped formations. Pure halite is usually colourless, transparent to translucent and has a vitreous lustre. In nature, however, it may also occur in white, grey, pink, orange, red, blue or violet. Different colours may be caused by mineral inclusions, small impurities, organic matter or defects in the crystal lattice. Coloured and well-developed crystals are among the most sought-after collectible halite specimens.
Physical properties
Halite is a relatively soft and brittle mineral. It reaches a hardness of approximately 2 to 2.5 on the Mohs scale, which means it can be scratched easily by harder objects. A typical property of halite is its perfect cubic cleavage. When broken, the mineral separates along flat surfaces and may form smaller cubic fragments. Because of its brittleness, the specimen must be handled carefully. Halite is also known for its high solubility in water. Even brief contact with water or exposure to high humidity may damage the surface of the crystals, their lustre and their sharp edges.
Occurrence and localities
Halite occurs in extensive salt deposits throughout the world. Important localities can be found in Poland, Germany, Austria, Pakistan, the United States, Spain and Romania. Well-known occurrences are also found around the Dead Sea and other modern salt lakes. Crystals may also form in salt mines, evaporation ponds and locations where highly mineralised water evaporates rapidly.
How should halite be cared for?
Halite should be stored in a dry place away from water and high humidity. Ideally, it should be kept in a closed display cabinet, protective box or sealed container. Never wash the specimen with water or clean it with a damp cloth. Dust may be removed very carefully with a soft, dry brush, while taking care not to break off any small crystals. When handling the specimen, it is advisable to hold it by its underside or by a less crystalline part. Direct contact with the crystals should be kept to a minimum because moisture and oils from the skin may gradually damage their surface.