bunsenite

Bunsenite is the naturally occurring form of nickel(II) oxide, NiO. It occurs as rare dark green crystal coatings. It crystallizes in the cubic crystal system and occurs as well formed cubic, octahedral and dodecahedral crystals. It is a member of the periclase group.

Key facts

Mineral.name: Bunsenite
Mineral.image: Bunsenite - Kochhütte, Helbra, Mansfeld-Südharz, Saxony-Anhalt, Germany.jpg
Mineral.caption: Bunsenite with unknown colorless crystals from the collection of the „Verein zur Förderung der Lithothek“, Munich (collection number A022658). Field of view 1 mm. Locality: Kochhütte, Helbra, Mansfeld-Südharz, Saxony-Anhalt, Germany
Mineral.category: Oxide mineral
Mineral.formula: NiO
Mineral.IMAsymbol: Bus
Mineral.strunz: 4.AB.25
Mineral.system: Cubic
Mineral.class: Hexoctahedral (mm) H–M symbol: (4/m 2/m)
Mineral.symmetry: Fmm
Mineral.unit cell: a = 4.1769 Å; Z = 4
Mineral.color: Dark pistachio-green
Mineral.habit: Octahedral crystal coatings, also cube or dodecahedron forms
Mineral.twinning: Observed
Mineral.cleavage: None
Mineral.mohs: 5.5
Mineral.luster: Vitreous
Mineral.streak: Brownish-black

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Wikidata facts

Image: Bunsenite - Kochhütte, Helbra, Mansfeld-Südharz, Saxony-Anhalt, Germany.jpg

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Strunz 8th edition (series ID, updated): IV/A.04
Nickel-Strunz '10th ed', review of (9th ed/ 2009 update): 4.AB.25
Commons category: Bunsenite
chemical formula: NiO
Nickel-Strunz 9th edition (updated 2009): 4.AB.25
IMA Mineral Symbol: Bse

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It was first described in 1868 for a sample from a hydrothermal nickel–uranium vein from Johanngeorgenstadt, Ore Mountains, Saxony, Germany and named for German chemist Robert Bunsen (1811–1899). Other occurrences include west of the Scotia talc mine near Bon Accord, Barberton district, Transvaal, South Africa and from Kambalda south of Kalgoorlie, Western Australia. The South African occurrence has evidence of thermal metamorphism of a nickel-rich meteorite. It occurs associated with native bismuth, annabergite, aerugite, xanthiosite in Germany; and with liebenbergite, trevorite, nickeloan serpentine, nickeloan ludwigite, violarite, millerite, gaspeite, nimite and bonaccordite in the South African occurrence.