Bunsenite

bunsenite

aerugite

xanthiosite

bonaccordite

Images

Formula: NiO
Simple oxide, periclase group
Specific gravity: 6.898
Hardness: 5½
Streak: Brownish black
Colour: Dark pistachio-green
Solubility: Soluble in acids with difficulty
Environments

Metamorphic environments
Hydrothermal environments
Meteorites possible

Localities

At the type locality, Johanngeorgenstadt, Erzgebirgskreis, Saxony, Germany, occurs in a hydrothermal nickel-uranium vein, associated with bismuth, annabergite, aerugite and xanthiosite (HOM).

At the Bon Accord Ni deposit, Barberton, Ehlanzeni District, Mpumalanga, South Africa, occurs in a small tabular nickel deposit at the contact between quartzite and serpentinised ultramafics; it apparently formed at about 730◦C and less than 2 kbar pressure, during thermal metamorphism, possibly of a nickel-rich meteorite. Associated minerals include liebenbergite, trevorite, nickel-rich serpentine, nickel-rich ludwigite, violarite, millerite, gaspéite, nimite and bonaccordite (HOM).

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