Berborite Mineral Data

Berborite Mineral Data +

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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)

IMA Status:

Approved IMA 1967

Locality:

Link to MinDat.org Location Data.

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 - PyramidalH-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),

Crystal Structure:

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Schlatti M , Naturwissenschaften , 54 (1967) p.587-587, Synthese und strukturtyp des berylliumborates Be2BO3(OH)*H2O, Locality: synthetic

View Additional jPOWD Structure files for Berborite
[1] [2] [3]

Physical Properties of Berborite

Cleavage:

[0001] Perfect

Color:

Colorless.

Density:

2.2

Diaphaniety:

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

Optical Data:

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

Calculated Properties of Berborite

Electron Density:

r_electron=2.05 gm/cc
note: r_Berborite=2.06 gm/cc.

Fermion Index

Fermion Index = 0.1799
Boson Index = 0.8201

Photoelectric:

PE_Berborite= 0.34 barns/electron
U=PE_Berborite x r_electron= 0.70 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Berborite is Not Radioactive

Berborite Classification

Dana Class:

26.1.1.1 (26)Hydrated Borates Containing Hydroxyl or Halogen

(26.1)Dana Type

(26.1.1)Dana Group

26.1.1.1 Berborite Be2(BO3)(OH,F)·(H2O) P 6₃ 6

Strunz Class:

V/G.06-10 V - Nitrates, Carbonates and Borates

V/G - "Insel" borates [BO3]3- "inseln"

V/G.06 - Berborite - Qilianshanite series

V/G.06-10 Berborite Be2(BO3)(OH,F)·(H2O) P 6₃ 6

V/G.06-20 Wightmanite Mg5(BO3)O(OH)5·2(H2O) I2/m 2/m

V/G.06-30 Shabynite Mg5(BO3)Cl2(OH)5·4(H2O) Unk. Mono

V/G.06-40 Canavesite Mg2(CO3)(HBO3)·5(H2O) P 2/m 2/m

V/G.06-50 Sakhaite Ca3Mg(BO3)2(CO3)·0.36(H2O) F 4₁32 4 3 2

V/G.06-60 Qilianshanite NaH4(CO3)(BO3)·2(H2O) C 2 2

Other Berborite Information

References:

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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris

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Berborite

Be2(BO3)(OH,F)·(H2O)
Dana No: 26.1.1.1 Strunz No: V/G.06-10
Locality:

Notes: