Xifengite Mineral Data

General Xifengite Information

Chemical Formula:

Fe5Si3

Composition:

Molecular Weight = 363.49 gm

Iron 76.82 % Fe

Silicon 23.18 % Si

______

100.00 %

Empirical Formula:

Fe²⁺₅Si₃

Environment:

Innermost in spheres, surrounded by nickel-iron minerals and their oxidation products, apparently of extraterrestrial origin, found in placers.

IMA Status:

Approved IMA 1984

Locality:

Yanshan area, Hebei Province, China. Link to MinDat.org Location Data.

Name Origin:

Named for the eastern passageway, Xifengkou, of the Great Wall of China.

Name Pronunciation:

Xifengite + Pronunciation

Synonym:

ICSD 42585

PDF 38-438

Xifengite Image

Images:

Xifengite Fersilicite

Comments: Reflected light image of cream white grain of xifengite (Xi) with exsolution of white gupeiite (Gu) and grey fersilicite (Fe). Epoxy grain mount.
Location: Isovskaya Field, Priasovje, Ukraine. Scale: Picture Size 0.7 mm.
© Thomas Witzke

Xifengite Crystallography

Axial Ratios:

a:c = 1:0.69832

Cell Dimensions:

a = 6.759, c = 4.72, Z = 2; V = 186.74 Den(Calc)= 6.46

Crystal System:

Hexagonal - Dihexagonal DipyramidalH-M Symbol (6/m 2/m 2/m) Space Group: P 6₃/mcm

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2(1), 1.92(0.8), 1.94(0.8),

Crystal Structure:

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Weill A R , Nature , 152 (1943) p.413-413, Structure of the eta phase of the iron-silicon system

Physical Properties of Xifengite

Cleavage:

None

Color:

Steel gray.

Density:

6.45

Diaphaneity:

Opaque

Habit:

Inclusions - Generally found as inclusions in other minerals.

Hardness:

5.5 - Knife Blade

Luster:

Metallic

Streak:

black

Optical Properties of Xifengite

Optical Data:

Uniaxial (?).

RL Anisotrophism:

Moderate, bluish gray to pale brown.

RL Color:

Gray with a yellow tint.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Xifengite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
402 nm	38.30	37.90
439 nm	38.40	38.90
480 nm	40.10	39.80
495 nm	42.00	40.40
546 nm	44.10	43.00
590 nm	46.20	44.90
624 nm	47.60	44.70
644 nm	45.30	44.20
657 nm	45.90	45.30

**Calculated Relative Intensity Colors of Xifengite in Air**
Relative Intensity	0%	30%	60%	90%	100%	120%	150%	180%	210%	230%
R₁
R₂

Calculated Properties of Xifengite

Electron Density:

Bulk Density (Electron Density)=6.11 gm/cc
note: Specific Gravity of Xifengite =6.46 gm/cc.

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Photoelectric:

PE_Xifengite= 24.27 barns/electron
U=PE_Xifengite x rElectron Density= 148.39 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Xifengite is Not Radioactive

Xifengite Classification

Dana Class:

01.01.23.03 (01)Native Elements

(01.01)with metallic elements other than the platinum group

(01.01.23)Suessite Group silicides

01.01.23.01 Suessite (Fe,Ni)3Si I m3m 4/m 3 2/m

01.01.23.02 Gupeiite Fe3Si F m3m 4/m 3 2/m

01.01.23.03 Xifengite Fe5Si3 P 6₃/mcm 6/m 2/m 2/m

01.01.23.04 Hapkeite! Fe2Si P m3m 4/m 3 2/m

01.01.23.05 Luobusaite! Fe0.83Si2 C mca 2/m 2/m 2/m

01.01.23.06 Mavlyanovite! Mn5Si3 P 6₃/mcm 6/m 2/m 2/m

01.01.23.07 Brownleeite! MnSi P 2₁3 2 3

Strunz Class:

01.BB.40 01 - ELEMENTS (Metals and intermetallic alloys; metalloids and nonmetals; carbides, silicides, nitrides, phosphides)

01.B - Metallic Carbides, Silicides, Nitrides and Phosphides

01.BB -Silicides

01.BB.40 Xifengite Fe5Si3 P 6₃/mcm 6/m 2/m 2/m

Other Xifengite Information

References:

NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic3)

See Also:

Links to other databases for Xifengite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Ask about Xifengite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

Print or Cut-and-Paste your Xifengite Specimen Label here :

Xifengite

Fe5Si3
Dana No: 01.01.23.03 Strunz No: 01.BB.40
Locality:

Notes: