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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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