(Staro-Pyshminskoye), Berezovskoe Au Deposit (Berezovsk Mines),
Berezovskii (Berezovskii Zavod), Ekaterinburg (Sverdlovsk),
Sverdlovskaya Oblast', Middle Urals, Urals Region, Russia
The name Pyrophyllite
comes from the Greek words for
fire and leaf in allusion to its tendency
to exfoliate into fan shapes when heated. Pyrophyllite
is an unusual mineral with regard to its crystal system;
occurs in two varieties, one is monoclinic and the other triclinic.
Ordinarily they would be treated as two distinct minerals, but all of their
other properties are identical and they are often associated and intergrown. Pyrophyllite
is also an unusual mineral in that it is somewhat flexible,
but not elastic. It
is a member of the Pyrophyllite-Talc Group of minerals
that also includes Talc.
Pyrophyllite is identical in physical properties to Talc.
The two are isomorphous, meaning they share the same monoclinic structure but have different chemistries.
is available as interesting and attractive mineral speciments
but never as faceted gems. However, it is available
rarely as radiating spray inclusions with pearly luster in
cabochons (as pictured above).
The main source of these beautiful inclusion cabochons is Minas
Some localities for rich or well-crystallized material
follow. In Russia, at Krassik, between Pyschminsk and
Beresov, Ural Mountains. From St. Niklas, Zermatt, Valais,
Switzerland. In Sweden, at Västanå, Kristianstad.
From near Ottré, Ardennes Mountains, Belgium.
In the USA, found near Ogilby, Imperial County, at Tres
Cerritos, Mariposa County, and the Champion mine, White
Mountains, Mono County, California; from near Quartzsite,
La Paz County, Arizona; at Staley, Randolph County,
Glendon and Robbins, Moore County, and Hillsborough,
Orange County, North Carolina; in the Brewer mine, Chesterfield
County, South Carolina; on Graves Mountain, Lincoln
County, Georgia. From Ibitiara, Bahia, Brazil, in large
crystals. In a number of mines in Nagano Prefecture,
and elsewhere in Japan.