Awaruite : Ni3Fe, Magnetite : Fe2+Fe3+2O4, Serpentine Subgroup : D3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn

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Copyright © Pavel M. Kartashov
minID: 9NA-DUV

Awaruite : Ni3Fe, Magnetite : Fe2+Fe3+2O4, Serpentine Subgroup : D3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn

Copyright © Pavel M. Kartashov  - This image is copyrighted. Unauthorized reproduction prohibited.
Dimensions: 4.7 cm x 3.5 cm x 1.7 cm

69.43 g waterworn nugget of 'Josephinite' - very special rock, mainly composed by Awaruite and other minerals, cemented by it. Here we can to see black micro-granular Magnetite and yellowish to greenish-brown Serpentine masses embedded within massive metallic-grey Awaruite matrix. Specimen size is 4.7x3.5x1.7 cm.
Awaruite is natural iron-nickel alloy with compositions within Ni3Fe-Ni2Fe range (Ni3Fe is more usual and widespread). Many people wrongly considering, that Josephenites are of meteoritic origin. In reality awaruite is extremely rare in metallic meteorites. Only in rare class of them - Oktibbehite (metallic meteorites with Ni>Fe) awaruite is comparatively common. In other nickel-iron meteorites awaruite absent at all. May be only 20-30 meteorites contains awaruite, while thousands of other are empty in this sence. So here, in Josephine County, awaruite is terrestrial mineral. Similar to other numerous localities on the Earth it was formed during water interaction with olivine of hyperbasitic rocks (dunites, peridotites) and with accompaniing this serpentinization process.
There are a lot of awaruite localities on the Earth, but Josephine Creek placers produce the best and largest known (up to 2.5 kg nuggets) its specimens.

Collected by Lonny Hodges. Pavel M. Kartashov collection and scan.

This photo has been shown 1657 times
Photo added:9th Sep 2013
Dimensions:2641x2171px (5.73 megapixels)

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