Barite

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Barite
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Barite

• Chemistry BaSO4, Barium Sulfate
• Class Sulfates
• Group Barite
• Uses ore of barium

http//www.galleries.com/minerals/sulfates/barite/
barite.htm
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Physical Characteristics

• Color is variable but is commonly found colorless
  or white, also blue, green, yellow and red
  shades.
• Luster is vitreous.
• Transparency crystals are transparent to
  translucent.
• Crystal System is orthorhombic 2/m 2/m 2/m
• Crystal Habits include the bladed crystals that
  are dominated by two large pinacoid faces top and
  bottom and small prism faces forming a jutting
  angle on every side. There are many variations of
  these faces but the flattened blades and tabular
  crystals are the most common. If the pinacoid
  faces become diminished or are absent, the
  resulting prismatic crystal has a rhombic cross
  section. Also scaly, lamellar, and even fibrous.
• Cleavage is perfect in one direction, less so in
  another direction.
• Fracture is conchoidal.
• Hardness is 3 - 3.5
• Specific Gravity is approximately 4.5 (heavy for
  translucent minerals)
• Streak is white.
• Associated Minerals are numerous but significant
  associations have been with chalcopyrite,
  calcite, aragonite, sulfur, pyrite, quartz,
  vanadinite, cerussite and fluorite among many
  others.
• Other Characteristics green color in flame test
  (see above).
• Notable Occurrences include Oklahoma, Connecticut
  and Colorado, USA England and Germany.
• Best Field Indicators are crystal habit, flame
  test and density.

http//www.galleries.com/minerals/sulfates/barite/
barite.htm
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Occurrence

• Lead-zinc veins in limestone
• Sedimentary exhalative (Sedex) deposits
• Rio Grande Rift (RGR) deposits
• Mississippi Valley type (MVT) deposits
• Sedimentary stratiform deposits
• volcanic massive sulfide deposits
• gangue in epithermal and mesothermal veins

http//en.wikipedia.org/wiki/Barite,
http//geoinfo.nmt.edu/staff/mclemore/imclass/home
.html (commodities1 lecture)
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Uses

• heavy cement
• weighting agent in petroleum well drilling mud
• filler or extender
• additive to cement, rubber, and urethane foam
• automobile paint primer
• friction products (brake and clutch pads)
• cement vessels that contain radioactive materials
• white pigment
• gastrointestinal x-ray milkshakes
• faceplate and funnelglass of cathode-ray tubes
  used for television sets and computer monitors to
  protect against radiation

http//geoinfo.nmt.edu/staff/mclemore/imclass/home
.html (commodities1 lecture)
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http//www.galleries.com/scripts/item.exe?ENLARGE
MineralsSulfatesBariteBAR-36
http//webmineral.com/data/Barite.shtml