Sulfate minerals are a class of minerals that contain the sulfate anion (SO42-). They are typically colorless or white, but can also be found in a variety of other colors, such as yellow, green, blue, and red. Sulfate minerals are found in a wide variety of geological environments, including evaporite deposits, hydrothermal veins, and sedimentary rocks.

Some common sulfate minerals include:

* Gypsum (CaSO4·2H2O)

* Anhydrite (CaSO4)

* Barite (BaSO4)

* Celestite (SrSO4)

* Anglesite (PbSO4)

* Epsomite (MgSO4·7H2O)

* Mirabilite (Na2SO4·10H2O)

Sulfate minerals are important economic minerals, and are used in a variety of applications, including:

* As a source of sulfur for the production of sulfuric acid

* As a fertilizer

* As a filler in paper, paint, and plastics

* As a component of cement and plaster

* As a water softener

Sulfate minerals can also be a source of environmental pollution, as they can release sulfur dioxide (SO2) gas into the atmosphere. This gas can contribute to acid rain and smog.