Pentlandite
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Pentlandite is an iron–nickel sulfide with the chemical formula 9S8. Pentlandite has a narrow variation range in nickel to iron ratios, but it is usually described as 1:1. In some cases, this ratio is
3.1 × 2.6 cm mass of pentlandite with some pyrrhotite
Pentlandite in pyrrhotite, ore specimen from the Sudbury Basin (field of view 3.4 cm)
Pentlandite specimen from Kambalda, Western Australia
Pentlandite occurring with pyrrhotite, chalcopyrite, and magnetite. Specimen from Sudbury, Ontario, Canada
Pyrrhotite
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Pyrrhotite is an iron sulfide mineral with the formula FeS. It is an iron-deficient nonstoichiometric variant of FeS, the mineral known as troilite. Pyrrhotite is also called magnetic pyrite, because
Pentlandite
…a narrow variation range in nickel to iron ratios (Ni:Fe), but it is usually described as 1:1. In some cases, this ratio is skewed by the presence of pyrrhotite inclusions. It also contains minor cobalt, usually at low levels as a fraction of weight. Pentlandite forms isometric crystals, but it is normally found…
Brassy, tabular crystals of pyrrhotite, with sphalerite and quartz, from Nikolaevskiy Mine, Primorskiy Kray, Russia. Specimen size: 5.3 × 4.1 × 3.8 cm
Pyrrhotite with pentlandite (late Paleoproterozoic, 1.85 G… | Flickr
Microscopic image of pyrrhotite under reflected light
Photomicrograph of pyrrhotite under reflected light appearing as cream-pink to beige irregular anhedral masses (5x/0.12 POL).