Pyrrhotite

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. Pyrrhotite is also called magnetic pyrite because the color is similar to pyrite and it is weakly magnetic. The magnetism decreases as the iron content decreases, and troilite is non-magnetic. ==Etymology and...
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Pyrrhotite

• (n.) A bronze-colored mineral, of metallic luster. It is a sulphide of iron, and is remarkable for being attracted by the magnet. Called also magnetic pyrites.
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pyrrhotite

pyrrhotine noun a brownish iron sulfide mineral (FeS) having weak magnetic properties
Found on https://www.encyclo.co.uk/local/20974

Pyrrhotite

A bronze-colored, magnetic iron sulfide mineral.
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Pyrrhotite

A sulphide mineral of iron, FeS.
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pyrrhotite

A yellow-tan iron sulfide mineral, approximately FeS.
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pyrrhotite

iron sulfide mineral (Fe1–xS) in the niccolite group; in it, the ratio of iron to sulfur atoms is variable but is usually slightly less than one. It ... [2 related articles]
Found on http://www.britannica.com/eb/a-z/p/138

pyrrhotite

pyrrhotite (pir'utīt) or magnetic pyrites,bronze-yellow to bronze-red mineral, a sulfide of iron sometimes containing nickel. It tarnishes easily and is somewhat magnetic. It crystallizes in the hexagonal system, but appears usually in massive form, and occurs chiefly in basic igneous rock...
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Pyrrhotite

Pyrrhotite is a magnetic common mineral often found in igneous rocks, and confirmed as a distinct species of mineral in 1835. It is an iron sulphide with the formulae FeS and a relative hardness of 5. It is mined for the nickel minerals associated with it.
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pyrrhotite

[n] - a brownish iron sulfide mineral FeS having weak magnetic properties
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