Liberite Mineral Data

General Liberite Information

Chemical Formula:

Li2BeSiO4

Composition:

Molecular Weight = 114.98 gm

Lithium 12.07 % Li 25.99 % Li₂O

Beryllium 7.84 % Be 21.75 % BeO

Silicon 24.43 % Si 52.26 % SiO₂

Oxygen 55.66 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Li₂Be(SiO₄)

Environment:

In veins cutting a lepidolite-Fluorite-magnetite "ribbon rock" in tactite.

IMA Status:

Approved IMA 1964

Locality:

Hsianghua Ridge, Linwu Co., Hunan Province, China. Link to MinDat.org Location Data.

Name Origin:

Presumably for LIthium and BERyllium in the composition.

Name Pronunciation:

Liberite

Liberite Crystallography

Axial Ratios:

a:b:c =1.2355:1:0.9514

Cell Dimensions:

a = 6.111, b = 4.946, c = 4.706, Z = 2; beta = 90.33° V = 142.24 Den(Calc)= 2.68

Crystal System:

Monoclinic - Domatic H-M Symbol (m) Space Group: Pn

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

By Intensity(I/I_o): 3.84(1), 3.72(1), 3.41(0.4),2.596(0.8), 2.471(0.6), 2.349(0.8), 2.273(0.6),

Physical Properties of Liberite

Cleavage:

{010} Perfect, {100} Distinct, {001} Distinct

Color:

Brown, Light yellow.

Density:

2.688

Diaphaneity:

Transparent to Translucent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Hardness:

7 - Quartz

Luster:

Vitreous - Greasy

Optical Properties of Liberite

Gladstone-Dale:

CI meas= 0.025 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.022 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2355,KPDmeas= 0.2348,KC= 0.2407
Ncalc = 1.65

Optical Data:

Biaxial (-), a=1.622, b=1.6332, g=1.638, bire=0.0160, 2V(Calc)=66, 2V(Meas)=66.3.

Calculated Properties of Liberite

Electron Density:

Bulk Density (Electron Density)=2.61 gm/cc
note: Specific Gravity of Liberite =2.68 gm/cc.

Fermion Index:

Fermion Index = 0.09
Boson Index = 0.91

Photoelectric:

PE_Liberite= 1.09 barns/electron
U=PE_Liberite x rElectron Density= 2.86 barns/cc.

Radioactivity:

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

Liberite Classification

Dana Class:

51.01.02.01 (51)Nesosilicate Insular SiO4 Groups Only

(51.01)with cations in [4] coordination

(51.01.02)Dana Group

51.01.02.01 Liberite Li2BeSiO4 Pn m

Strunz Class:

09.AA.10 09 - SILICATES (Germanates)

09.A - Nesosilicates

09.AA -Nesosilicates without additional anions;

09.AA.10 Liberite Li2BeSiO4 Pn m

Other Liberite Information

References:

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

See Also:

Links to other databases for Liberite :
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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Print or Cut-and-Paste your Liberite Specimen Label here :

Liberite

Li2BeSiO4
Dana No: 51.01.02.01 Strunz No: 09.AA.10
Locality:

Notes:

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