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Laihunite Mineral Data

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General Laihunite Information

Help on Chemical  Formula: Chemical Formula: Fe++Fe+++2(SiO4)2
Help on Composition: Composition: Molecular Weight = 351.71 gm
   Iron     47.64 %  Fe   20.43 % FeO / 45.40 % Fe2O3
   Silicon  15.97 %  Si   34.17 % SiO2
   Oxygen   36.39 %  O
           ______        ______ 
           100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Fe2+Fe3+2(SiO4)2
Help on Environment: Environment: In a Precambrian metamorphic iron deposit, probably derived by oxidation of fayalite.
Help on IMA Status: IMA Status: Approved IMA 1976
Help on Locality: Locality: Little Lai-He village, Liaoning Province, China. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Name Pronunciation: Name Pronunciation: Laihunite + Pronunciation Say LAIHUNITE
 

Laihunite Image

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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

Laihunite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.4715:1:0.5693
Help on Cell Dimensions: Cell Dimensions: a = 4.805, b = 10.189, c = 5.801, Z = 2; beta = 90° V = 284.01 Den(Calc)= 4.11
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/b
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.52(1), 3.47(0.9), 2.78(0.8),
 

Physical Properties of Laihunite

Help on Cleavage: Cleavage: {001} Good, {100} Perfect, {010} Perfect
Help on Color: Color: Dark brown, Black.
Help on Density: Density: 3.92
Help on Diaphaneity: Diaphaneity: Opaque
Help on Hardness: Hardness: 6 - Orthoclase
Help on Luster: Luster: Sub Metallic
Help on Streak: Streak: light brown
 

Optical Properties of Laihunite

Help on Optical Data: 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
 

Calculated Properties of Laihunite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.97 gm/cc
note: Specific Gravity of Laihunite =4.11 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PELaihunite = 14.96 barns/electron
U=PELaihunite x rElectron Density= 59.43 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Laihunite is Not Radioactive
 

Laihunite Classification

Help on  Dana Class: Dana Class: 51.03.01.05 (51)Nesosilicate Insular SiO4 Groups Only
  (51.03)with all cations in octahedral [6] coordination
  (51.03.01)Olivine group
 
51.03.01.00 Olivine* (Mg,Fe)2SiO4 Pbnm 2/m 2/m 2/m
 
51.03.01.01 Fayalite Fe2SiO4 Pbnm 2/m 2/m 2/m
 
51.03.01.02 Forsterite Mg2SiO4 Pbnm 2/m 2/m 2/m
 
51.03.01.03 Liebenbergite (Ni,Mg)2SiO4 Pbnm 2/m 2/m 2/m
 
51.03.01.04 Tephroite Mn2SiO4 P nma 2/m 2/m 2/m
 
51.03.01.05 Laihunite FeFe2(SiO4)2 P 21/b 2/m
Help on  Strunz Class: Strunz Class: 09.AC.05 09 - SILICATES (Germanates)
  09.A - Nesosilicates
  09.AC -Nesosilicates without additional anions;
 
09.AC.05 Forsterite Mg2SiO4 Pbnm 2/m 2/m 2/m
 
09.AC.05 Glaucochroite CaMnSiO4 Pbnm 2/m 2/m 2/m
 
09.AC.05 Fayalite Fe2SiO4 Pbnm 2/m 2/m 2/m
 
09.AC.05 Olivine* (Mg,Fe)2SiO4 Pbnm 2/m 2/m 2/m
 
09.AC.05 Kirschsteinite CaFeSiO4 Pbmn 2/m 2/m 2/m
 
09.AC.05 Laihunite FeFe2(SiO4)2 P 21/b 2/m
 
09.AC.05 Liebenbergite (Ni,Mg)2SiO4 Pbnm 2/m 2/m 2/m
 
09.AC.05 Tephroite Mn2SiO4 P nma 2/m 2/m 2/m
 

Other Laihunite Information

Help on References: References: NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: 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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