Schreibersite
Iron-nickel phosphide — rare on Earth but a standard accessory of iron meteorites; also called rhabdite.
Intro adapted from Wikipedia (CC BY-SA).
Schreibersite is an IMA-recognized mineral species in the native element class, with the chemical formula (Fe,Ni)₃P.
It crystallizes in the tetragonal crystal system (space group I-4).
Key properties: Mohs hardness 6.5–7; specific gravity 7–7.3; Brilliant metallic luster.
IMA symbol Scb, grandfathered status — known before the IMA’s founding, named in 1848.
Found in nearly all iron meteorites, but lacking in those which are nickel deficient; rare in stony meteorites. Terrestrial occurrences are in reduced differentiated lenses in basalt (Disko Island, Greenland).
It is found associated with Kamacite, tetrataenite (meteorites); iron, cohenite, troilite, wüstite (Disko Island, Greenland).
The mineral was named to honor Karl Franz Anton von Schreibers (1775–1852), of Vienna, Austria.