Laihunite Mineral Data

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General Laihunite Information

Chemical Formula:

Fe++Fe+++2(SiO4)2

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

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

Laihunite Image

Images:

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

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 - PrismaticH-M Symbol (2/m) Space Group: P 2₁/b

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

By Intensity(I/I_o): 2.52(1), 3.47(0.9), 2.78(0.8),

Crystal Structure:

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Ferrifayalite Research Group , Acta Geologica Sinica , 50 (1976) p.161-175, Ferrifayalite and its crystal structure, Locality: Liaoning Province, China, Note: Reported SiO bond lengths of 1.9 could not be reproduced

Physical Properties of Laihunite

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

Optical Properties of Laihunite

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

Electron Density:

Bulk Density (Electron Density)=3.97 gm/cc
note: Specific Gravity of Laihunite =4.11 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Laihunite= 14.96 barns/electron
U=PE_Laihunite x rElectron Density= 59.43 barns/cc.

Radioactivity:

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

Laihunite Classification

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

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

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 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - MinMax(Deutsch)
11 - MinMax(English)
12 - Mineralienatlas (Deutsch)
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: