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Barite (BaSO4) is a mineral consisting of barium sulfate.The barite group consists of barite, celestine, anglesite and anhydrite. Barite is generally white or colorless, and is the main source of barium. Barite and celestine form a solid solution (Ba,Sr)SO4.

The radiating form, sometimes referred to as Bologna Stone, attained some notoriety among alchemists for the phosphorescent specimens found in the 17th century near Bologna by Vincenzo Casciarolo.

The American Petroleum Institute specification API 13/ISO 13500, which governs barite for drilling purposes, does not refer to any specific mineral, but rather a material that meets that specification. In practice, however, this is usually the mineral barite.

The term "primary barites" refers to the first marketable product, which includes crude barite (run of mine) and the products of simple beneficiation methods, such as washing, jigging, heavy media separation, tabling, flotation. Most crude barite requires some upgrading to minimum purity or density. barite that is used as an aggregate in a "heavy" cement is crushed and screened to a uniform size. Most barite is ground to a small, uniform size before it is used as a filler or extender, an addition to industrial products, in the production of barium chemicals or a weighting agent in petroleum well drilling mud.

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Measurements of barite

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