Awaruite
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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. Wikipedia
Crystal class: Hexoctahedral (m3m); H-M symbol: (4/m 3 2/m)
Crystal habit: Massive; as pebbles, grains and flakes; rarely as crystals; as rims or regular intergrowths with kamacite in meteorites
Crystal system: Cubic
Formula (repeating unit): Ni2Fe to Ni3Fe
Specific gravity: 7.8–8.65