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Mineralpedia Details for Pyrrhotite

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Pyrrhotite

Pyrrhotite

Named after the Greek pyrrhos, meaning “russet,” which is a dark brown with hints of red-orange similar to the color of the mineral. Pyrrhotite has thousands of localities and occurs in igneous rocks as magmatic segregations and can also be found in pegmatites, hydrothermal and replacement veins, sedimentary rock, metamorphic rock, and in iron meteorites. Pyrrhotite is magnetic, however the degree to which it is magnetic varies inversely with the iron content.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/pyrrhotite.pdf

Formula
Fe7S8 
Crystal System
Monoclinic 
Crystal Habit
Tabular, Platy, Massive - Granular 
Cleavage
Imperfect, Imperfect, None 
Luster
Metallic 
Color
bronze, bronze red, dark brown 
Streak
gray black 
Class
Monoclinic - Prismatic 
Fracture
Uneven 
Hardness
3.5-4 
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Pyrrhotite from Santa Eulalia, Chihuahua, Mexico

Pyrrhotite
            from Santa Eulalia, Chihuahua, Mexico

An incredible large crystal group of solid Pyrrhotite with the largest crystal measuring 6.5cm!

Another group with crystals to 1.5cm.

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Pyrrhotite from Nikolaevskiy mine, Dal'negorsk, Russia

Pyrrhotite
            from Nikolaevskiy mine, Dal'negorsk, Russia

Brassy excellent barrel-shaped Pyrrhotite crystal.

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PYRRHOTITE from Gap mine, Lancaster Co., Pennsylvania, United States

PYRRHOTITE
            from Gap mine, Lancaster Co., Pennsylvania, United States

A chunk composed of all Pyrrhotite from this old nickel mine.

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Pyrrhotite from Herja mine, Baia Mare, Maramures Co., Romania

Pyrrhotite
            from Herja mine, Baia Mare, Maramures Co., Romania

Stacked, tapering crude hexagonal plates. 

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Pyrrhotite from Morro Velho mine, Nova Lima, Minas Gerais, Brazil

Pyrrhotite
            from Morro Velho mine, Nova Lima, Minas Gerais, Brazil

This is truly an amazingly brilliant large Pyrrhotite with incredible goldish bronze color. The largest crystal has a face to 4.5cm. 

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Pyrrhotite from Chihuahua, Mexico

Pyrrhotite
            from Chihuahua, Mexico

Nice combination specimen of golden plates of Pyrrhotite to 8mm with corroded Galena and Quartz.

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Pyrrhotite from Nairn Centre, Sudbury, Canada

Pyrrhotite
            from Nairn Centre, Sudbury, Canada

Sawed flat on one side to show the brassy, magnetic, portions of Pyrrhotite, which is associated with Chalcopyrite and possible Gersdorffite.

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