2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides,
antimonides, bismuthides; sulfarsenites, sulfantimonites,
sulfbismuthites, etc.) F : Sulfides of arsenic, alkalies; sulfides with halide, oxide, hydroxide, H2O
C : With Cl, Br, I (halide-sulfides)
thallium analog of Djerfisherite.
is an extremely rare thallium
chlor-sulfide mineral that is found as
tiny (5 - 30 μm) subhedral to euhedral grains,
typically triangular in cross-section, enclosed within
pentlandite-galena-chalcopyrite ore aggregates. The
crystals are visible only with a microscope.
"cabochon" in the picture above is a scientific specimen consisting of a 4.6mm sample in an
analytical mount. The sample is a polished chalcopyrite crystal containing
a microscopic grain of Thalfenisite.
The sample has been analysed using a scanning electron
and verified to contain Thalfenisite.
is a bronze brown, opaque, soft mineral with a Mohs
hardness of 1 - 1.5 and metallic luster. Thalfenisite
is very unusual in that it has an extremely high molecular
weight of 3,510.71 gm.
Compare this to the molecular weights of Diamond
(12.01 gm), Quartz (60.08
gm) and Cerussite
name reflects its composition of THALlium, FErrum
for iron, NIckel and Sulfur (Thal-fe-ni-s-ite).
was discovered in 1979 by N. S. Rudashevsky, A. M. Karpenkov,
G. S. Shipova, N. N. Shishkin and V. A. Ryabikin at
the Oktyabr'skoe Cu-Ni deposit,
Plateau, Taimyr Peninsula, Taymyrskiy Autonomous Okrug, Eastern-Siberian
Region, Russia. This is the only occurrence of Thalfenisite known to date.
gems for sale:
have not photographed our Thalfenisite gems yet. Please
check back soon.