Nickeline
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Nickeline or niccolite is the mineral form of nickel arsenide. The naturally occurring mineral contains roughly 43.9% nickel and 56.1% arsenic by mass, but composition of the mineral may vary slightly
Nickeline
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
Nickeline
…hydrothermal modification of ultramafic rocks and associated ore deposits, and may be formed by replacement of nickel-copper bearing sulfides (replacing pentlandite, and in association with copper arsenic sulfides), or via metasomatism of sulfide-free ultramafic rocks, where metasomatic fluids introduce sulfur…
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