Berborite Mineral Data

General Berborite Information

Chemical Formula:

Be2(BO3)(OH,F)•(H2O)

Composition:

Molecular Weight = 112.35 gm

Beryllium 16.04 % Be 44.52 % BeO

Boron 9.62 % B 30.98 % B₂O₃

Hydrogen 2.47 % H 22.05 % H₂O

Oxygen 67.64 % O

Fluorine 4.23 % F 4.23 % F

- % F -1.78 % -O=F₂

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Be₂(BO₃)(OH)_0.75F_0.25•(H₂O)

Environment:

Serpentinized dolostone associated with W-Sr-B-Be-bearing skarns

IMA Status:

Approved IMA 1967

Locality:

Luppikko deposit, Pitkï¿½aranta district, Lake Ladoga, Karelia, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for the BERyllium and BORate in the composition.

Name Pronunciation:

Berborite + Pronunciation

Berborite Image

Images:

Berborite

Comments: Colorless, nearly transparent crystalline berborite in matrix.
Location: Saga Quarry, Tvedalen, Vestfold, Norway. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Berborite Crystallography

Axial Ratios:

a:c = 1:2.39972

Cell Dimensions:

a = 4.433, c = 10.638, Z = 2; V = 181.04 Den(Calc)= 2.06

Crystal System:

Hexagonal - Pyramidal H-M Symbol (6) Space Group: P 6₃

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

By Intensity(I/I_o): 2.656(1), 3.11(1), 5.3(1),

Physical Properties of Berborite

Cleavage:

{0001} Perfect

Color:

Colorless.

Density:

2.2

Diaphaneity:

Transparent

Fracture:

Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.

Hardness:

3 - Calcite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Berborite

Gladstone-Dale:

CI meas= 0.033 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.032 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2585,KPDmeas= 0.242,KC= 0.2504
Ncalc = 1.52 - 1.55

Optical Data:

Uniaxial (-), e=1.485, w=1.58, bire=0.0950.

Calculated Properties of Berborite

Electron Density:

Bulk Density (Electron Density)=2.05 gm/cc
note: Specific Gravity of Berborite =2.06 gm/cc.

Fermion Index:

Fermion Index = 0.17
Boson Index = 0.83

Photoelectric:

PE_Berborite= 0.34 barns/electron
U=PE_Berborite x rElectron Density= 0.70 barns/cc.

Radioactivity:

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

Berborite Classification

Dana Class:

26.01.01.01 (26)Hydrated Borates Containing Hydroxyl or Halogen

(26.01)Dana Type

(26.01.01)Dana Group

26.01.01.01 Berborite Be2(BO3)(OH,F)•(H2O) P 6₃ 6

Strunz Class:

06.AB.10 06 - BORATES

06.A - Monoborates

06.AB -BO3, with additional anions; 1(D) + OH, etc.

06.AB.10 Berborite Be2(BO3)(OH,F)•(H2O) P 6₃ 6

Other Berborite Information

References:

NAME( AntBidBlaNic5) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Berborite :
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 Berborite Specimen Label here :

Berborite

Be2(BO3)(OH,F)•(H2O)
Dana No: 26.01.01.01 Strunz No: 06.AB.10
Locality:

Notes:

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