Liebenbergite Mineral Data

Liebenbergite Mineral Data +

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General Liebenbergite Information

Chemical Formula:

(Ni,Mg)2SiO4

Composition:

Molecular Weight = 192.27 gm

Magnesium 6.32 % Mg 10.48 % MgO

Silicon 14.61 % Si 31.25 % SiO₂

Nickel 45.79 % Ni 58.27 % NiO

Oxygen 33.29 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ni_1.5Mg_0.5SiO₄

IMA Status:

Approved IMA 1973

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 100865

PDF 15-388

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Liebenbergite Crystallography

Axial Ratios:

a:b:c =0.4669:1:0.5839

Cell Dimensions:

a = 4.725, b = 10.118, c = 5.908, Z = 4; V = 282.45 Den(Calc)= 4.52

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pbnm

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

By Intensity(I/I_o): 2.43(1), 3.469(0.9), 2.744(0.85),

Crystal Structure:

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Lager G A , Meagher E P , American Mineralogist , 63 (1978) p.365-377, High-temperature structural study of six olivines, T = 25 deg C, synthetic Ni2SiO4

View Additional jPOWD Structure files for Liebenbergite
[1] [2] [3] [4] [5] [6] [7] [8] [9]

Physical Properties of Liebenbergite

Color:

Yellow green.

Density:

4.6

Diaphaniety:

Transparent to Translucent

Hardness:

6 - Orthoclase

Luster:

Vitreous - Greasy

Streak:

white

Optical Properties of Liebenbergite

Gladstone-Dale:

CI meas= 0.015 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.002 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1889,KPDmeas= 0.1857,KC= 0.1885

Optical Data:

Biaxial (-), a=1.82, b=1.854, g=1.888, bire=0.0680, 2V(Calc)=88, 2V(Meas)=80.

Calculated Properties of Liebenbergite

Electron Density:

r_electron=4.42 gm/cc
note: r_{Liebenbergite}=4.52 gm/cc.

Fermion Index

Fermion Index = 0.01847
Boson Index = 0.98153

Photoelectric:

PE_{Liebenbergite}= 18.88 barns/electron
U=PE_{Liebenbergite} x r_electron= 83.43 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Liebenbergite is Not Radioactive

Liebenbergite Classification

Dana Class:

51.3.1.3 (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.04-40 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 Liebenbergite Information

References:

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

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Liebenbergite

(Ni,Mg)2SiO4
Dana No: 51.3.1.3 Strunz No: VIII/A.04-40
Locality:

Notes: