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andalusite and sillimanite are minerals with the same chemical formula,
but with different crystal structures and chemical properties.
theoretical composition is about 63 percent alumina and 37 percent
is available in varying grain sizes down to 325 mesh and in
decomposed mullite form is volume-stable with temperature increase,
while the raw form of kyanite displays definite expansion during heatup.
United States is the largest producer, with all of the kyanite coming
from central Virginia.
Mining Corp-orationís 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.
interlocking grain structure of andalusite, kyanite and mullite gives
added mechanical strength to refractories and other nonrefractory
- Other end
uses of kyanite and related materials include brake shoes and pads,
electrical porcelain, foundry use, precision casting molds and sanitary
- 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
has proven invaluable in cements, ramming mixes, and mortars for this
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