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General
-
Pyrophyllite is a phyllosilicate mineral species belonging to the clay
family and composed of aluminium silicate hydroxide( AlSi2O5OH).
- It occurs
in two more or less distinct varieties, namely, as crystalline folia and
as compact masses; distinct crystals are not known.
-
Pyrophyllite occurs in phyllite and schistose rocks, often associated
with kyanite, of which it is an alteration product.
Process
- In the
grinding process of Pyrophyllite, some effects such as delamination,
gliding and folding of the layers, and decrease in particle size were
detected by SEM and XRD, resulting in a large increase in specific
surface area.
- Clays in
Las Aguilas Formation were characterized by mechanical, X-ray powder
diffraction, chemical, differential thermal, dilatometric, thin section,
and electron microscopy analyses.
- Most
samples are strongly cemented with Fe203, and their dispersion is
sometimes very difficult.
Report
- A
geological report written at that time concluded that there was a
deposit of 1.5 million tons of ore to a depth of 300 feet.
- The
Newfoundland government assumed control of the property under the
Undeveloped Mineral Area Act of 1952.
- It
was reopened in 1956 by Newfoundland Minerals Limited, a subsidiary of a
company that later became the American Olean Tile Company.
Application
- It is
added to clay to reduce thermal expansion when firing but it has many
other industry uses when combined with other compounds, such as in
insecticide and for making bricks.
- More
recently, this property has seen it used as a machinable ceramic
material used for electrical resistors, transducer cores, high vacuum
gaskets and insulators in electron microscopes.
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