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Xifengite Mineral Data
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General Xifengite Information
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 Chemical Formula: |
Fe5Si3 |
| Composition: |
Molecular Weight = 363.49 gm |
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Iron 76.82 % Fe |
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Silicon 23.18 % Si |
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______ |
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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 |
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PDF 38-438 |
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Xifengite Image |
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Images:
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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 |
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Xifengite Crystallography
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| 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 Dipyramidal H-M Symbol (6/m 2/m 2/m) Space Group: P 63/mcm |
| X Ray Diffraction: |
By Intensity(I/Io): 2(1), 1.92(0.8), 1.94(0.8), |
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Physical Properties of Xifengite
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| 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 |
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Optical Properties of Xifengite
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| 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 |
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∑ R1(λ) |
∑ R2(λ) |
| 402 nm |
38.30 |
37.90 |
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| 439 nm |
38.40 |
38.90 |
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| 480 nm |
40.10 |
39.80 |
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| 495 nm |
42.00 |
40.40 |
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| 546 nm |
44.10 |
43.00 |
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| 590 nm |
46.20 |
44.90 |
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| 624 nm |
47.60 |
44.70 |
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| 644 nm |
45.30 |
44.20 |
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| 657 nm |
45.90 |
45.30 |
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Calculated Relative Intensity Colors of Xifengite in Air
Relative
Intensity |
0% |
30% |
60% |
90% |
100% |
120% |
150% |
180% |
210% |
230% |
| R1 |
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| R2 |
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Calculated Properties of Xifengite
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| Electron Density: |
Bulk Density (Electron Density)=6.11 gm/cc
note: Specific Gravity of Xifengite =6.46 gm/cc.
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| Fermion Index: |
Fermion Index = 0.02
Boson Index = 0.98 |
| Photoelectric: |
PEXifengite = 24.27 barns/electron
U=PEXifengite x rElectron Density= 148.39 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Xifengite is Not Radioactive |
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Xifengite Classification
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| Dana Class: |
01.01.23.03 (01)Native Elements |
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(01.01)with metallic elements other than the platinum group |
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(01.01.23)Suessite Group silicides |
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01.01.23.01 Suessite (Fe,Ni)3Si I m3m 4/m 3 2/m |
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01.01.23.02 Gupeiite Fe3Si F m3m 4/m 3 2/m |
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01.01.23.03 Xifengite Fe5Si3 P 63/mcm 6/m 2/m 2/m |
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01.01.23.04 Hapkeite! Fe2Si P m3m 4/m 3 2/m |
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01.01.23.05 Luobusaite! Fe0.83Si2 C mca 2/m 2/m 2/m |
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01.01.23.06 Mavlyanovite! Mn5Si3 P 63/mcm 6/m 2/m 2/m |
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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) |
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01.B - Metallic Carbides, Silicides, Nitrides and Phosphides |
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01.BB -Silicides |
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01.BB.40 Xifengite Fe5Si3 P 63/mcm 6/m 2/m 2/m |
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Other Xifengite Information
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| 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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Print or Cut-and-Paste your Xifengite Specimen Label here :
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Xifengite
Fe5Si3
Dana No: 01.01.23.03 Strunz No: 01.BB.40
Locality:
Notes:
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