Schreibersite
Chemical compound
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Schreibersite is generally a rare iron nickel phosphide mineral, (Fe, Ni)₃P, though common in iron-nickel meteorites. It has been found on Disko Island in Greenland and Illinois.
Another name used for the mineral is rhabdite. It forms tetragonal... Wikipedia
Color: Silver-white to tin-white, tarnishes brass-yellow or brown
Crystal class: Disphenoidal (4); H-M symbol: (4)
Crystal habit: Rarely in crystals, hoppered, plates, tablets, rods or needles
Crystal system: Tetragonal
Mohs scale hardness: 6.5–7
Optical properties: Uniaxial
Space group: I4