Nickeline

It's advisable to handle nickeline carefully to avoid generating dust and wash hands thoroughly afterward. When cutting or polishing nickeline, wear a dust mask to prevent inhaling heavy metal particles. Store nickeline in a sealed container in a well-ventilated area, away from children and pets. For those involved in crystal healing, never put it in your mouth.

Nickeline is formed by 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, carbonate, and arsenic. This typically results in mineral assemblaged including millerite, heazelwoodite and metamorphic pentlandite-pyrite via sulfidation and associated arsenopyrite-nickeline-breithauptite. Associated minerals include: arsenopyrite, barite, silver, cobaltite, pyrrhotite, pentlandite, chalcopyrite, breithauptite and maucherite. Nickeline alters to annabergite (a coating of green nickel arsenate) on exposure to moist air. Most of these minerals can be found in the areas surrounding Sudbury and Cobalt, Ontario. Other localities include the eastern flank of the Widgiemooltha Dome, Western Australia, from altered pentlndite-pyrite-pyrrhotite assemblages within the Mariners, Redross and Miitel nickel mines where nickeline is produced by regional Au-As-Ag-bearing alteration and carbonate metasomatism. Other occurrences include within similarly modified nickel mines of the Kambalda area.

The unit cell of nickeline is used as the prototype of a class of solids with similar crystal structures. It consists of arsenic atoms in a distorted hexagonal close-packed structure with nickel atoms in "octahedral" sites, which in NiAs have distorted to become trigonal prismatic. Compounds adopting the NiAs structure are generally the chalcogenides, arsenides, antimonides and bismuthides of transition metals. The following are the members of the nickeline group: Achavalite: FeSe Breithauptite: NiSb Freboldite: CoSe Kotulskite: Pd(Te,Bi) Langistite: (Co,Ni)As Nickeline: NiAs Sobolevskite: Pd(Bi,Te) Sudburyite: (Pd,Ni)Sb

Nickeline is an important ore of nickel, which is an essential metal for batteries, alloy production, and for stainless steel. This mineral is occasionally used as a gemstone in jewelry such as bolo ties, rings, and pendants. However, any use of nickeline is rare because it contains arsenic.

When, in the medieval German Erzgebirge, or Ore Mountains, a red mineral resembling copper-ore was found, the miners looking for copper could extract none from it, as it contains none; worse yet, the ore also sickened them. They blamed a mischievous sprite of German mythology, Nickel (similar to Old Nick) for besetting the copper (German: Kupfer). This German equivalent of "copper-nickel" was used as early as 1694 (other old German synonyms are Rotnickelkies and Arsennickel). In 1751, Baron Axel Fredrik Cronstedt was attempting to extract copper from kupfernickel mineral, and obtained instead a white metal that he called after the spirit, nickel. In modern German, Kupfernickel and Kupfer-Nickel designates the alloy Cupronickel. The names subsequently given to the ore, nickeline from F. S. Beudant, 1832, and niccolite, from J. D. Dana, 1868, refer to the presence of nickel; in Latin, niccolum. In 1971, the International Mineralogical Association recommended use of the name nickeline rather than niccolite.