Mineralogy Database

Xifengite Mineral Data

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General Xifengite Information

Help on Chemical  Formula: Chemical Formula: Fe5Si3
Help on Composition: Composition: Molecular Weight = 363.49 gm
   Iron     76.82 %  Fe
   Silicon  23.18 %  Si
           100.00 % 
Help on Empirical Formula: Empirical Formula: Fe2+5Si3
Help on Environment: Environment: Innermost in spheres, surrounded by nickel-iron minerals and their oxidation products, apparently of extraterrestrial origin, found in placers.
Help on IMA Status: IMA Status: Approved IMA 1984
Help on Locality: Locality: Yanshan area, Hebei Province, China. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the eastern passageway, Xifengkou, of the Great Wall of China.
Help on Name Pronunciation: Name Pronunciation: Xifengite + Pronunciation Say XIFENGITE
Help on Synonym: Synonym: ICSD 42585
  PDF 38-438

Xifengite Image

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  Fersilicite   Xifengite

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

Help on Axial Ratios: Axial Ratios: a:c = 1:0.69832
Help on Cell Dimensions: Cell Dimensions: a = 6.759, c = 4.72, Z = 2; V = 186.74 Den(Calc)= 6.46
Help on Crystal System: Crystal System: Hexagonal - Dihexagonal Dipyramidal H-M Symbol (6/m 2/m 2/m) Space Group: P 63/mcm
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2(1), 1.92(0.8), 1.94(0.8),

Physical Properties of Xifengite

Help on Cleavage: Cleavage: None
Help on Color: Color: Steel gray.
Help on Density: Density: 6.45
Help on Diaphaneity: Diaphaneity: Opaque
Help on Habit: Habit: Inclusions - Generally found as inclusions in other minerals.
Help on Hardness: Hardness: 5.5 - Knife Blade
Help on Luster: Luster: Metallic
Help on Streak: Streak: black

Optical Properties of Xifengite

Help on Optical Data: Optical Data: Uniaxial (?).
Help on RL Anisotrophism: RL Anisotrophism: Moderate, bluish gray to pale brown.
Help on RL Color: RL Color: Gray with a yellow tint.
Help on Reflectivity 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
   0%   30%   60%   90% 100% 120% 150% 180% 210% 230%

Calculated Properties of Xifengite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=6.11 gm/cc
note: Specific Gravity of Xifengite =6.46 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PEXifengite = 24.27 barns/electron
U=PEXifengite x rElectron Density= 148.39 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Xifengite is Not Radioactive

Xifengite Classification

Help on  Dana Class: Dana Class: (01)Native Elements
  (01.01)with metallic elements other than the platinum group
  (01.01.23)Suessite Group silicides Suessite (Fe,Ni)3Si I m3m 4/m 3 2/m Gupeiite Fe3Si F m3m 4/m 3 2/m Xifengite Fe5Si3 P 63/mcm 6/m 2/m 2/m Hapkeite! Fe2Si P m3m 4/m 3 2/m Luobusaite! Fe0.83Si2 C mca 2/m 2/m 2/m Mavlyanovite! Mn5Si3 P 63/mcm 6/m 2/m 2/m Brownleeite! MnSi P 213 2 3
Help on  Strunz Class: 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

Help on References: References: NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic3)
Help on See Also: 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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Dana No: Strunz No: 01.BB.40





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