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Awaruite
View on Wikipedia| Awaruite | |
|---|---|
 Awaruite pebble from Josephine County, Oregon, US | |
| General | |
| Category | Native element mineral |
| Formula | Ni2Fe to Ni3Fe |
| IMA symbol | Awr[1] |
| Strunz classification | 1.AE.20 Metals and intermetallic alloys |
| Dana classification | 01.01.11.04 Iron–nickel group |
| Crystal system | Cubic |
| Crystal class | Hexoctahedral (m3m) H-M symbol: (4/m 3 2/m) |
| Space group | Pm3m |
| Identification | |
| Color | Silver-white to grayish white |
| Crystal habit | Massive; as pebbles, grains and flakes; rarely as crystals; as rims or regular intergrowths with kamacite in meteorites |
| Tenacity | Malleable and flexible |
| Mohs scale hardness | 5.5–6 |
| Luster | Metallic |
| Diaphaneity | Opaque |
| Specific gravity | 7.8–8.65 |
| Other characteristics | Strongly magnetic |
| References | [2][3][4] |
Awaruite is a naturally occurring alloy of nickel and iron with a composition from Ni2Fe to Ni3Fe.
Awaruite occurs in river placer deposits derived from serpentinized peridotites and ophiolites. It also occurs as a rare component of meteorites. It occurs in association with native gold and magnetite in placers; with copper, heazlewoodite, pentlandite, violarite, chromite, and millerite in peridotites; with kamacite, allabogdanite, schreibersite and graphite in meteorites.[2]
It was first described in 1885 for an occurrence along Gorge River, near Awarua Bay, South Island, New Zealand, its type locality.[2][3]
Awaruite is also known as josephinite in an occurrence in Josephine County, Oregon where it is found as placer nuggets in stream channels and masses in serpentinized portions of the Josephine peridotite. Some nuggets contain andradite garnet.[5]
An occurrence of awaruite was examined as an ore mineral in a large low grade deposit in central British Columbia, some 90 km northwest of Fort St. James. In the deposit awaruite occurs disseminated in the Mount Sidney Williams ultramafic/ophiolite complex.[6]
References
[edit]- ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
- ^ a b c http://rruff.geo.arizona.edu/doclib/hom/awaruite.pdf Handbook of Mineralogy
- ^ a b http://www.mindat.org/min-439.html Mindat.org
- ^ http://www.webmineral.com/data/Awaruite.shtml Webmineral data
- ^ John M. Bird and Maura S. Weathers, Origin of josephinite, Geochemical Journal, Vol. 13, pp. 41 to 55, 1979 [1]
- ^ FPX Nickel Confirms Anticipated Timing for Completion of Preliminary Economic Assessment on Baptiste Nickel Deposit