Anhydrite

You will receive one piece of crystal, the total weight of the piece will be at least the amount quoted in the variation.


Anhydrite is a mineral composed of calcium sulfate (CaSO4) that is chemically very similar to gypsum (calcium sulfate dihydrate, CaSO4·2H2O). The primary difference between the two minerals is the presence of water molecules in gypsum, which gives it a different crystalline structure and physical properties. Anhydrite, as the name suggests, is anhydrous, meaning it lacks water molecules in its crystal structure.

Here are some key characteristics and information about anhydrite:

    Chemical Composition: Anhydrite has the chemical formula CaSO4, which means it consists of one calcium (Ca) atom, one sulfur (S) atom, and four oxygen (O) atoms. It is a sulfate mineral.

    Crystal Structure: Anhydrite crystallizes in the orthorhombic crystal system. Its crystals typically form in prismatic or tabular shapes, and it has a rhombic cleavage that distinguishes it from gypsum.

    Color: Anhydrite can be colorless, white, gray, blue, or even pinkish. Its coloration can vary depending on impurities present in the mineral.

    Hardness: Anhydrite has a Mohs hardness of 3.5 to 4. It is relatively soft compared to many other minerals.

    Luster: Its luster is typically vitreous (glass-like) or pearly.

    Occurrence: Anhydrite is commonly found in sedimentary rocks, especially in evaporite deposits. It often forms as a result of the dehydration of gypsum when the surrounding environment becomes arid. It can also occur in hydrothermal veins and as a gangue mineral in ore deposits.

    Industrial Uses:

        Anhydrite has various industrial applications, including as a component in the production of cement. When anhydrite is heated, it can be ground into a fine powder and used as a mineral additive in the cement-making process.

        It is also used as a desiccant (drying agent) and in some construction materials.

        Anhydrite can be used in the manufacturing of plaster and as a filler in various products.

    Anhydrite Varieties:

        Angelite: A variety of anhydrite that is found in bluish or violet-blue coloration. It is often used as a decorative stone in jewelry and carvings.

        Cripple Creekite: This variety contains strontium, which gives it a green or bluish-green color.

    Associated Minerals: Anhydrite is commonly associated with other evaporite minerals such as halite (rock salt) and sylvite (potassium chloride), as well as with minerals like calcite, dolomite, and celestine.

    Geographic Distribution: Anhydrite deposits can be found worldwide, but notable occurrences include Germany, Poland, the United States, Mexico, Brazil, and the United Kingdom, among others.

Overall, anhydrite is an important mineral in various industrial processes, and its unique properties and association with geological formations make it a subject of interest for geologists and mineral enthusiasts.