Barite

Barite is a mineral composed of barium sulfate (BaSO4). It receives its name from the Greek word "barys" which means "heavy." This name is in response to barite's high specific gravity of 4.5, which is exceptional for a nonmetallic mineral. The high specific gravity of barite makes it suitable for a wide range of industrial, medical, and manufacturing uses. Barite also serves as the principal ore of barium.

Barite

Barite Occurrence

Barite often occurs as concretions and void-filling crystals in sediments and sedimentary rocks. It is especially common as concretions and vein fillings in limestone and dolostone. Where these carbonate rock units have been heavily weathered, large accumulations of barite are sometimes found at the soil-bedrock contact. Many of the commercial barite mines produce from these residual deposits.

Barite is also found as concretions in sand and sandstone. These concretions grow as barite crystallizes within the interstitial spaces between sand grains. Sometimes crystals of barite grow into interesting shapes within the sand. These structures are known as "barite roses" (see photo). They can be up to several inches in length and incorporate large numbers of sand grains. Occasionally barite is so abundant in a sandstone that it serves as the "cement" for the rock.

Barite is also a common mineral in hydrothermal veins and is a gangue mineral associated with sulfide ore veins. It is found in association with ores of antimony, cobalt, copper, lead, manganese, and silver. In a few locations barite is deposited as a sinter at hot springs.

Physical Properties of Barite

Barite is generally easy to identify. It is one of just a few nonmetallic minerals with a specific gravity of four or higher. Combine that with its low Mohs hardness (2.5 to 3.5) and its three directions of right-angle cleavage, and the mineral can usually be reliably identified with just three observations.

In the classroom, students often have difficulty identifying specimens of massive barite with fine-grained crystals. They look at the specimen, see the sugary appearance, correctly attribute it to cleavage, and apply a drop of dilute hydrochloric acid. The mineral effervesces and they think that they have calcite or a piece of marble. The problem is that the effervescence is caused by contamination. The students tested the hardness of the barite with a piece of calcite from their hardness kit. Or the specimen of barite can naturally contain calcite. However, any student who tests the specific gravity will discover that calcite or marble are incorrect identifications.

Barite is also a good mineral to use when teaching about specific gravity. Give students several white mineral specimens that are about the same size (we suggest calcite, quartz, barite, talc, gypsum). Students should be able to easily identify barite using the "heft test" (placing Specimen "A" in their right hand and Specimen "B" in their left hand and "hefting" the specimens to determine which one is heaviest). Students in third or fourth grade are capable of using the heft test to identify barite.


Physical Properties of Barite

Chemical Classification Sulfate
Color Colorless, white, light blue, light yellow, light red, light green
Streak White
Luster Vitreous to pearly
Diaphaneity Transparent to translucent
Cleavage Very good, basal, prismatic
Mohs Hardness 2.5 to 3.5
Specific Gravity 4.5
Diagnostic Properties High specific gravity, three cleavage directions at right angles
Chemical Composition Barium sulfate, BaSO4
Crystal System Orthorhombic
Uses Drilling mud; high-density filler for paper, rubber, plastics

Uses of Barite

Most barite produced is used as a weighting agent in drilling muds. This is what 99% of the barite consumed in the United States is used for. These high-density muds are pumped down the drill stem, exit through the cutting bit and return to the surface between the drill stem and the wall of the well. This flow of fluid does two things: 1) it cools the drill bit; and, 2) the high-density barite mud suspends the rock cuttings produced by the drill and carries them up to the surface.

Barite is also used as a pigment in paints and as a weighted filler for paper, cloth and rubber. The paper used to make some playing cards has barite packed between the paper fibers. This gives the paper a very high density that allows the cards to be "dealt" easily to players around a card table. Barite is used as a weighting filler in rubber to make "anti-sail" mudflaps for trucks.

Barite is the primary ore of barium, which is used to make a wide variety of barium compounds. Some of these are used for x-ray shielding. Barite has the ability to block x-ray and gamma-ray emissions. Barite is used to make high-density concrete to block x-ray emissions in hospitals, power plants, and laboratories.

Barite compounds are also used in diagnostic medical tests. If a patient drinks a small cup of liquid that contains a barium powder in a milkshake consistency, the liquid will coat the patient's esophagus. An x-ray of the throat taken immediately after the "barium swallow" will image the soft tissue of the esophagus (which is usually transparent to x-rays) because the barium is opaque to x-rays and blocks their passage. A "barium enema" can be used in a similar way to image the shape of the colon.


Sources: Geology.com

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