Xifengite

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Xifengite
General
Category Native element minerals
Formula
(repeating unit)
Fe5Si3
Strunz classification 1.BB.40
Crystal system Hexagonal
Crystal class Dihexagonal dipyramidal (6/mmm)
H-M symbol: (6/m 2/m 2/m)
Space group P63/mcm
Unit cell a = 6.759(5)
c = 4.720(5) [Å]; Z = 2
Identification
Color Gray, steel-black
Crystal habit As inclusions
Mohs scale hardness 5
Luster Metallic
Streak Black
Diaphaneity Opaque
References [1][2]

Xifengite (Fe5Si3) is a rare metallic iron silicide mineral. The crystal system of xifengite is hexagonal. It has a specific gravity of 6.45 and a Mohs hardness of 5.5. It occurs as steel gray inclusions within other meteorite derived nickel iron mineral phases.

It was first described in 1984 and named for the eastern passageway, Xifengkou, of the Great Wall of China. The type locality is the Yanshan meteorite of the Hebei Province, China. It has also been reported from dredgings along the East Pacific Rise.

The other known natural iron silicide minerals are gupeiite (Fe3Si), hapkeite (Fe2Si), linzhiite (FeSi2), luobusaite (Fe0.84Si2), naquite (FeSi), suessite (Fe,Ni)3Si, and zangboite (TiFeSi2).[3]

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