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
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).
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
Pyrrhotite
…igneous rocks like norites, and may form from pyrite during metamorphic processes. Pyrrhotite is associated and mined with other sulfide minerals like pentlandite, pyrite, chalcopyrite, and magnetite, and has been found globally. Pyrrhotite exists as a number of polytypes of hexagonal or monoclinic crystal symmetry…
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