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Information @ a Glance

Contents on the CD Rom

• Kyanite, andalusite and sillimanite are minerals with the same chemical formula, but with different crystal structures and chemical properties.
• The theoretical composition is about 63 percent alumina and 37 percent silica.
•  The three minerals are sometimes referred to as the “sillimanite group.”
• The mineral can occur in metamorphic rocks but is not often in a form that can be easily extracted.
• Kyanite, andalusite and sillimanite ,these minerals convert to mullite  and silica upon “calcining,” or heating from about 1,250 degrees Celsius to 1,500 degrees Celsius.
• Kyanite is available in varying grain sizes down to 325 mesh and in calcined-to-mullite form.
•  The decomposed mullite form is volume-stable with temperature increase, while the raw form of kyanite displays definite expansion during heat up.
•  The United States is the largest producer, with all of the kyanite coming from central Virginia.
• Kyanite Mining Corp-oration’s ore deposits are kyanite quartzites containing 15 to 40 percent kyanite and usually about 5 percent of other minerals such as mica, pyrite and rutile.
• South Africa is the leading producing country of andalusite, with an estimated 235,000 metric tons of marketable output of the mineral.
• France produces an estimated 65,000 tons per year of andalusite.
•  China reportedly has some production of andalusite, but official data have not been received by the U.S. Geological Survey.
• The interlocking grain structure of andalusite, kyanite and mullite gives added mechanical strength to refractories and other nonrefractory ceramic materials.
• It is used primarily as an additive in the production of high-temperature ceramic products such as furnace bricks, but is also used in abrasives, brake shoes, cookware, and a wide variety of other industrial and consumer products.
• Kyanite has proven invaluable in cements, ramming mixes, and mortars for this purpose.

• Kyanite Information
• Kyanite

Process

• Deformation-related reaction and (re)equilibration processes
• Kyanite Pseudomorphs after Andalusite from the Teplá Crystalline Complex
• Ultra-high Excess Argon in Kyanites: Implications for Ultra-high Pressure Metamorphism
• Kyanite Process
• Qualification of Micronized Kyanite and Silica Fume
• Nano-milling of the sillimanite mineral, kyanite, and its reactions with alumina to form mullite
• Virginia Minerals

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