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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.
- 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
- Clays in
Las Aguilas Formation were characterized by mechanical, X-ray powder
diffraction, chemical, differential thermal, dilatometric, thin section,
and electron microscopy analyses.
samples are strongly cemented with Fe203, and their dispersion is
sometimes very difficult.
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.
Newfoundland government assumed control of the property under the
Undeveloped Mineral Area Act of 1952.
was reopened in 1956 by Newfoundland Minerals Limited, a subsidiary of a
company that later became the American Olean Tile Company.
- 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.
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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