Laihunite Mineral Data

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

IMA Status:

Approved IMA 1976

Locality:

Link to MinDat.org Location Data.

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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),

Physical Properties of Laihunite

Cleavage:

[001] Good, [100] Perfect, [010] Perfect

Color:

Dark brown, Black.

Density:

3.92

Diaphaniety:

Opaque

Hardness:

6 - Orthoclase

Luster:

Sub Metallic

Streak:

light brown

Calculated Properties of Laihunite

Electron Density:

r_electron=3.97 gm/cc
note: r_Laihunite=4.11 gm/cc.

Fermion Index

Fermion Index = 0.01773
Boson Index = 0.98227

Photoelectric:

PE_Laihunite= 14.96 barns/electron
U=PE_Laihunite x r_electron= 59.43 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Laihunite is Not Radioactive

Laihunite Classification

Dana Class:

51.3.1.5 (51)Nesosilicate Insular SiO4 Groups Only

(51.3)with all cations in octahedral [6] coordination

(51.3.1)Olivine group

51.3.1.0 Olivine* (Mg,Fe)2SiO4 Pbnm 2/m 2/m 2/m

51.3.1.1 Fayalite Fe2SiO4 Pbnm 2/m 2/m 2/m

51.3.1.2 Forsterite Mg2SiO4 Pbnm 2/m 2/m 2/m

51.3.1.3 Liebenbergite (Ni,Mg)2SiO4 Pbnm 2/m 2/m 2/m

51.3.1.4 Tephroite Mn2SiO4 P nma 2/m 2/m 2/m

51.3.1.5 Laihunite FeFe2(SiO4)2 P 2₁/b 2/m

Strunz Class:

VIII/A.04-50 VIII - Silicates

VIII/A - Nesosilicates with [SiO4]4-groups, cations of octahedral orientation [6]

VIII/A.04 - Olivine group

VIII/A.04-10 Forsterite Mg2SiO4 Pbnm 2/m 2/m 2/m

VIII/A.04-20 Fayalite Fe2SiO4 Pbnm 2/m 2/m 2/m

VIII/A.04-30 Tephroite Mn2SiO4 P nma 2/m 2/m 2/m

VIII/A.04-40 Liebenbergite (Ni,Mg)2SiO4 Pbnm 2/m 2/m 2/m

VIII/A.04-50 Laihunite FeFe2(SiO4)2 P 2₁/b 2/m

Other Laihunite Information

References:

PHYS. PROP.(Enc. of Minerals,2nd ed.,1990)

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Print or Cut-and-Paste your Laihunite Specimen Label here :

Laihunite

Fe++Fe+++2(SiO4)2
Dana No: 51.3.1.5 Strunz No: VIII/A.04-50
Locality:

Notes: