awaruite


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awaruite

[‚a·wä′rü‚īt]
(mineralogy)
Native nickel-iron alloy containing 57.7% nickel.
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Occurrence: In "plessite," an intergrowth of taenite and kamacite; other associated minerals are: nickelphosphide, schreibersite, awaruite and graphite.
This former nickel mine is the type locality for heazlewoodite and hellyerite, and the source of many rare minerals, including awaruite, dypingite, retgersite, reevesite, theophrastite and several new, unnamed minerals.
The primary mineralization consists of nickel sulfides (pentlandite and heazlewoodite) with minor Ni-Fe alloy (awaruite) intergrown with grains of magnetite and various silicates (Williams, 1958).
Petterd (1910) described awaruite as silver to grayish white masses occurring in polished ore sections.
Colloform aggregates replacing magnetite, with awaruite, occur.
Ramdohr (1969) considered awaruite to be typically formed in ultrabasic rocks during or following metamorphism, at <200[degrees]C, by reduction of iron in magnetite, possibly by hydrogen released during serpentinization (hydration of olivine to produce serpentine, hydrogen and magnetite).
The alteration of magnetite to andradite, awaruite and heazle-woodite thus indicates the late, probably granite-related, nature of the mineralization, as opposed to the magmatic source proposed by Williams (1958).
Reevesite is rarer and appears to derive from reaction of carbonate-rich waters with nickel and ferric iron released from the oxidation of awaruite and pentlandite.
Associated minerals are: "iridosmine," "rutheniridium," laurite, tulameenite, awaruite, iron, copper, zinc, oregonite, pentlandite and other sulfides.