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Laihunite Mineral Data
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General Laihunite Information
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 Chemical Formula: |
Fe++Fe+++2(SiO4)2 |
| Composition: |
Molecular Weight = 351.71 gm |
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Iron 47.64 % Fe 20.43 % FeO / 45.40 % Fe2O3 |
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Silicon 15.97 % Si 34.17 % SiO2 |
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Oxygen 36.39 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
| Empirical Formula: |
Fe2+Fe3+2(SiO4)2 |
| Environment: |
In a Precambrian metamorphic iron deposit, probably derived by oxidation of fayalite. |
| IMA Status: |
Approved IMA 1976 |
| Locality: |
Little Lai-He village, Liaoning Province, China. Link to MinDat.org Location Data. |
| Name Origin: |
Named for the locality. |
| Name Pronunciation: |
Laihunite + Pronunciation  |
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Laihunite Image |
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Images:
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Laihunite
Comments: B&W optical micrograph of eulysite in reflected light. Fayalite (Fa) in dark gray with rhe layered laihunite (La) in light gray, pyroxene (Py), and magnetite (Mt). AmMin v69:154.
Location: Hebei Iron mine, China.
Scale: See Image.
© American Mineralogist |
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Laihunite Crystallography
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| Axial Ratios: |
a:b:c =0.4715:1:0.5693 |
| Cell Dimensions: |
a = 4.805, b = 10.189, c = 5.801, Z = 2; beta = 90° V = 284.01 Den(Calc)= 4.11 |
| Crystal System: |
Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/b |
| X Ray Diffraction: |
By Intensity(I/Io): 2.52(1), 3.47(0.9), 2.78(0.8), |
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Physical Properties of Laihunite
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| Cleavage: |
{001} Good, {100} Perfect, {010} Perfect |
| Color: |
Dark brown, Black. |
| Density: |
3.92 |
| Diaphaneity: |
Opaque |
| Hardness: |
6 - Orthoclase |
| Luster: |
Sub Metallic |
| Streak: |
light brown |
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Optical Properties of Laihunite
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| Optical Data: |
NCalc= 2.04 - from Gladstone-Dale relationship (KC = 0.2525) where Ncalc=Dcalc*KC+1
NCalc= 1.99 - from Gladstone-Dale relationship (KC = 0.2525) where Ncalc=Dmeas*KC+1
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Calculated Properties of Laihunite
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| Electron Density: |
Bulk Density (Electron Density)=3.97 gm/cc
note: Specific Gravity of Laihunite =4.11 gm/cc.
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| Fermion Index: |
Fermion Index = 0.01
Boson Index = 0.99 |
| Photoelectric: |
PELaihunite = 14.96 barns/electron
U=PELaihunite x rElectron Density= 59.43 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Laihunite is Not Radioactive |
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Laihunite Classification
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| Dana Class: |
51.03.01.05 (51)Nesosilicate Insular SiO4 Groups Only |
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(51.03)with all cations in octahedral [6] coordination |
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(51.03.01)Olivine group |
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51.03.01.00 Olivine* (Mg,Fe)2SiO4 Pbnm 2/m 2/m 2/m |
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51.03.01.01 Fayalite Fe2SiO4 Pbnm 2/m 2/m 2/m |
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51.03.01.02 Forsterite Mg2SiO4 Pbnm 2/m 2/m 2/m |
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51.03.01.03 Liebenbergite (Ni,Mg)2SiO4 Pbnm 2/m 2/m 2/m |
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51.03.01.04 Tephroite Mn2SiO4 P nma 2/m 2/m 2/m |
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51.03.01.05 Laihunite FeFe2(SiO4)2 P 21/b 2/m |
| Strunz Class: |
09.AC.05 09 - SILICATES (Germanates) |
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09.A - Nesosilicates |
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09.AC -Nesosilicates without additional anions; |
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09.AC.05 Forsterite Mg2SiO4 Pbnm 2/m 2/m 2/m |
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09.AC.05 Glaucochroite CaMnSiO4 Pbnm 2/m 2/m 2/m |
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09.AC.05 Fayalite Fe2SiO4 Pbnm 2/m 2/m 2/m |
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09.AC.05 Olivine* (Mg,Fe)2SiO4 Pbnm 2/m 2/m 2/m |
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09.AC.05 Kirschsteinite CaFeSiO4 Pbmn 2/m 2/m 2/m |
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09.AC.05 Laihunite FeFe2(SiO4)2 P 21/b 2/m |
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09.AC.05 Liebenbergite (Ni,Mg)2SiO4 Pbnm 2/m 2/m 2/m |
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09.AC.05 Tephroite Mn2SiO4 P nma 2/m 2/m 2/m |
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Other Laihunite Information
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| References: |
NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) |
| See Also: |
Links to other databases for Laihunite :
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
15 - WWW-MINCRYST
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Laihunite
Fe++Fe+++2(SiO4)2
Dana No: 51.03.01.05 Strunz No: 09.AC.05
Locality:
Notes:
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