Diomignite Mineral Data

General Diomignite Information

Chemical Formula:

Li2B4O7

Composition:

Molecular Weight = 169.12 gm

Lithium 8.21 % Li 17.67 % Li₂O

Boron 25.57 % B 82.33 % B₂O₃

Oxygen 66.22 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Li₂B₄O₇

Environment:

Abundant in fluid inclusions in spodumene crystallized from a late-stage hydrothermal fluid in a granite pegmatite.

IMA Status:

Approved IMA 1987

Locality:

Tanco pegmatite, Bernic Lake, Manitoba, Canada. Link to MinDat.org Location Data.

Name Origin:

Named from the Greek meaning divine mix, in allusion to its likely pronounced fluxing effects.

Name Pronunciation:

Diomignite + Pronunciation

Synonym:

ICSD 300010

PDF 18-717

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Diomignite Crystallography

Axial Ratios:

a:c = 1:1.08542

Cell Dimensions:

a = 9.47, c = 10.279, Z = 8; V = 921.83 Den(Calc)= 2.44

Crystal System:

Tetragonal - Ditetragonal PyramidalH-M Symbol (4mm) Space Group: I 4₁cd

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

By Intensity(I/I_o): 4.07(1), 2.662(0.6), 3.495(0.5),

Crystal Structure:

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Krogh-Moe J , Acta Crystallographica , 15 (1962) p.190-193, The crystal structure of lithium diborate, Li2O*2B2O3, Locality: synthetic

Physical Properties of Diomignite

Color:

Colorless.

Diaphaneity:

Transparent

Streak:

white

Optical Properties of Diomignite

Gladstone-Dale:

CI calc= -0.033 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2389,KC= 0.2313
Ncalc = 1.56

Optical Data:

Uniaxial (-), e=1.554, w=1.612, bire=0.0580.

Calculated Properties of Diomignite

Electron Density:

Bulk Density (Electron Density)=2.37 gm/cc
note: Specific Gravity of Diomignite =2.44 gm/cc.

Fermion Index:

Fermion Index = 0.05
Boson Index = 0.95

Photoelectric:

PE_Diomignite= 0.33 barns/electron
U=PE_Diomignite x rElectron Density= 0.77 barns/cc.

Radioactivity:

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

Diomignite Classification

Dana Class:

24.05.04.01 (24)Borates - Anhydrous

(24.05)with miscellaneous formulae

(24.05.04)Dana Group

24.05.04.01 Diomignite Li2B4O7 I 4₁cd 4mm

Strunz Class:

06.DD.05 06 - BORATES

06.D - Tetraborates

06.DD -Tekto-tetraborates

06.DD.05 Diomignite Li2B4O7 I 4₁cd 4mm

Other Diomignite Information

References:

NAME( AntBidBlaNic5) PHYS. PROP.(Am.Min.,Vol.73,p928,1988) OPTIC PROP.(Am.Min.,Vol.73,p928,1988)

See Also:

Links to other databases for Diomignite :
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

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

Diomignite

Li2B4O7
Dana No: 24.05.04.01 Strunz No: 06.DD.05
Locality:

Notes: