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

Environment:

In a small tabular nickel deposit at the contact between quartzite and serpentinized ultramafics; it appears to have formed at »730 ±C and < 2 kbar during thermal metamorphism, poss ibly of a nickel-rich meteorite.

IMA Status:

Approved IMA 1973

Locality:

From three km west of the Scotia Talc mine, Bon Accord, Barberton, Transvaal, South Africa. Link to MinDat.org Location Data.

Name Origin:

Named for W.R. Liebenberg, Deputy Director-General of the National Institute for Metallurgy of South Africa.

Name Pronunciation:

Liebenbergite + Pronunciation

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

Diaphaneity:

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
Ncalc = 1.85 - 1.87

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:

Bulk Density (Electron Density)=4.42 gm/cc
note: Specific Gravity of Liebenbergite =4.52 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

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

Radioactivity:

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

Liebenbergite Classification

Dana Class:

51.03.01.03 (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 Liebenbergite Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Liebenbergite :
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 - University of Colorado - Mineral Structure Data
16 - WWW-MINCRYST

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Liebenbergite

(Ni,Mg)2SiO4
Dana No: 51.03.01.03 Strunz No: 09.AC.05
Locality:

Notes: