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Pyrrhotite  from Dal'negorsk, Primorskiy Kray, Russia

Pyrrhotite is an unusual iron sulfide mineral in the niccolite group with up to 20% variable amounts of iron and or
sulfur. Pyrrhotite is also called magnetic pyrite because the color is similar to pyrite and it is weakly magnetic.
The magnetism increases as the iron content decreases. Pyrrhotite has two forms. When Pyrrhotite is low in
sulfur and the formula is closer to true iron sulfide(FeS), then the structure is hexagonal. But when it is high in
sulfur, the structure is monoclinic. Pyrrhotite is found with pentlandite in basic igneous rocks, veins and
metamorphic rocks. It is also often found with pyrite, marcasite and magnetite.

Pyrrhotite is weakly magnetic. It is the second most common magnetic mineral. (magnetite is the most
common). It has varying magnetic powers. The strength depends upon the number of iron atom vacancies in the
crystal structure. Many specimens may not show evidence of magnetism but the best test to try is to see if it will
attract a small paper clip, needle on a string or even move a compass needle.  A related species with no iron
atom vacancies (and therefore non-magnetic), is called troilite and has been found in meteorites and rarely on
earth .Massive Pyrrhotite is common and magnetism is sometimes the only way to distinguish it from other
brassy colored sulfides such as chalcopyrite, pyrite, pentlandite or marcasite.

Nice Pyrrhotite hexagonal crystals are rare and should highly be treasured. Quality specimens of this mineral
are very difficult to find and are very expensive. Some of the nicest come from Dal'negorsk in Russia.
Dal'negorsk, also known as Tetyukhe, is a famous mining region in the Kavalerovo Mining District, Primorskiy
Kray, Far-Eastern Region, Russia, which is about 300 km north east of Vladivostok. The name "Tetyukhe"
(which means "valley of the wild boars") is the old Chinese name for Dal'negorsk. You may find some
specimens with old mineral labels with the locale listed as Tetyukhe. It was formerly known from its founding in
1897 as Tetyukhe until it was renamed Dal'negorsk in 1972.
Hexagonal Pyrrhotite, Galena, Sphalerite and Quartz Crystals

You are seeing a very attractive specimen of Pyrrhotite from Dal'negorsk,
Russia. Twinned hexagonal crystals up to 1" (26mm) set this rare piece off.
With its flowering quartz needles, sphalerite and galena accents this piece
from our personal collection is all in all, a truly beautiful specimen and quite
uncommon in this quality. This find is

This specimen weighs 27.1 oz or 1.69 lb (770g)
and measures 3.5 x 3.1 x 2.8 inches (8.9 x 7.9 x 7.2cm)
map from
Item # PYYR071335741
Pyyrhotite, Galena, Sphalerite and Quartz
from Dal'negorsk, Russia