Pearly radial cluster of pyrophyllite from Hillsboro District, Orange County, North Carolina (Size: 11 x 7.3 x 6.6 cm)
|Crystal symmetry||Monoclinic / triclinic|
|Unit cell||a = 5.16 Å, b = 8.966(3) Å, c = 9.347(6) Å; α = 91.18°, β = 100.46°, γ = 89.64°; Z = 2|
|Color||Brown green, brownish yellow, greenish, gray green, gray white|
Compact spherulitic aggregates of needlelike radiating crystals; asfine grained foliated laminae, granular, massive
|Crystal system||Monoclinic 2/m - prismatic or triclinic 1 pinacoidal|
|Mohs scale hardness||1.5-2|
|Luster||Pearly to dull|
|Diaphaneity||Translucent to opaque|
|Specific gravity||2.65 - 2.9|
|Optical properties||Biaxial (-)|
|Refractive index||nα=1.534-1.556, nβ=1.586-1.589, nγ=1.596-1.601|
Pyrophyllite is a phyllosilicate mineral composed of aluminium silicate hydroxide: Al2Si4O10(OH)2. It occurs in two more or less distinct varieties, namely, as crystalline folia and as compact masses; distinct crystals are not known.
The folia have a pronounced pearly lustre, owing to the presence of a perfect cleavage parallel to their surfaces: they are flexible but not elastic, and are usually arranged radially in fan-like or spherical groups. This variety, when heated before the blowpipe, exfoliates and swells up to many times its original volume, hence the name pyrophyllite, from the Greek pyros (fire) and phyllos (a leaf), given by R. Hermann in 1829. The color of both varieties is white, pale green, greyish or yellowish; they are very soft (hardness of 1 to 1.5) and are greasy to the touch. The specific gravity is 2.65 - 2.85. The two varieties are thus very similar to talc.
Pyrophyllite occurs in phyllite and schistose rocks, often associated with kyanite, of which it is an alteration product. It also occurs as hydrothermal deposits. Typical associated minerals include: kyanite, andalusite, topaz, mica and quartz.
Deposits containing well-crystallized material are found in:
- Manuels, Newfoundland and Labrador, Canada, talc-like bright white appearance, high grade, no impurities; 21 million ton deposit. Currently owned and operated by Trinity Resources Ltd.
- Russia - pale green foliated masses, very like talc in appearance, are found at Beresovsk near Yekaterinburg in the Urals.
- St. Niklas, Zermatt, Valais, Switzerland
- at Vaastana, Kristianstad, Sweden
- near Ottrje, Ardennes Mountains, Belgium
- Ibitiara, Bahia, Brazil
- Nagano Prefecture, Japan
It is also reported from South Africa where major deposits of pyrophyllite occur within the Ottosdal region, where it is mined for the production of a variety of manufactured goods and blocks are quarried and marketed as "Wonderstone" for the carving of sculptures.
The compact variety of pyrophyllite is used for slate pencils and tailors chalk (French chalk), and is carved by the Chinese into small images and ornaments of various kinds. Other soft compact minerals (steatite and pinite) used for these Chinese carvings are included with pyrophyllite under the terms agalmatolite and pagodite.
Pyrophyllite is easily machineable and has excellent thermal stability. Therefore 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. Pyrophyllite is also widely used in high-pressure experiments, both as a gasket material and as a pressure-transmitting medium.
- http://webmineral.com/data/Pyrophyllite.shtml Webmineral
- Handbook of Mineralogy
- Hurlbut, Cornelius S.; Klein, Cornelis, 1985, Manual of Mineralogy, 20th ed., p. 430 ISBN 0-471-80580-7
- L. Fang et al. (2007). "Effect of precompression on pressure-transmitting efficiency of pyrophyllite gaskets". journal High Pressure Research 27: 367. Bibcode:2007HPR....27..367F. doi:10.1080/08957950701553796.