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Pyrrhotite is an unusual iron sulfide mineral with a variable iron content: Fe (1-x) S (x = 0 to 0.2). The FeS endmember is known as troilite. Also called magnetic pyrite because the color is similar to pyrite and it is weakly magnetic, the magnetism increases as the iron content decreases.
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Pyrrhotite has some unusual characteristics. First, it has an unusual formula. The amount of sulfur does vary by roughly 20% or 50 to 55 atoms of sulfur per 50 atoms of iron.
pyrrhotite (pĭr`ətīt) or magnetic pyrites, bronze-yellow to bronze-red mineral, a sulfide of iron sometimes containing nickel. It tarnishes easily and is somewhat magnetic.
Pyrrhotite is found with Pentlandite in basic igneous rocks, veins and metamorphic rocks. It is also often found with Pyrite, Marcasite and Magnetite. It has varying magnetic ...
pyrrhotite: Definition and Pronunciation
Britannica online encyclopedia article on pyrrhotite: iron sulfide mineral (Fe1–xS) in the niccolite group; in it, the ratio of iron to sulfur atoms is variable but is usually ...
More on pyrrhotite from Infoplease: pyrrhotite: meaning and definitions - pyrrhotite: Definition and Pronunciation; Suggestions for spelling of encyclopedia/pyrrhotite - The ...
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