Behierite Mineral Data

Behierite Mineral Data +

General Behierite Information

Chemical Formula:

(Ta,Nb)BO4

Composition:

Molecular Weight = 233.75 gm

Tantalum 58.06 % Ta 70.89 % Ta₂O₅

Niobium 9.94 % Nb 14.21 % Nb₂O₅

Boron 4.62 % B 14.89 % B₂O₃

Oxygen 27.38 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ta_0.75Nb_0.25(BO₄)

IMA Status:

Approved IMA 1962

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 63202

PDF 7-131

Behierite Image

Images:

Behierite

Comments: A light brownish crystal of behierite in matrix.
Location: Manjaka, Sahatany Valley, Antsirabe Region, Madagascar. Scale: Picture size 5 mm.
© Thomas Witzke / Abraxas-Verlag

Behierite Crystallography

Axial Ratios:

a:c = 1:0.88172

Cell Dimensions:

a = 6.206, c = 5.472, Z = 4; V = 210.75 Den(Calc)= 7.37

Crystal System:

Tetragonal - Ditetragonal DipyramidalH-M Symbol (4/m 2/m 2/m) Space Group: I 4₁/amd

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

By Intensity(I/I_o): 4.1(1), 2.327(0.71), 3.1(0.71),

Physical Properties of Behierite

Color:

Pink gray.

Density:

7.81 - 7.91, Average = 7.86

Fracture:

Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).

Hardness:

7-7.5 - Quartz-Garnet

Luster:

Adamantine

Streak:

white

Optical Properties of Behierite

Optical Data:

NCalc= 2.31 - from Gladstone-Dale relationship (KC = 0.1772) where Ncalc=Dcalc*KC+1
NCalc= 2.39 - from Gladstone-Dale relationship (KC = 0.1772) where Ncalc=Dmeas*KC+1

Calculated Properties of Behierite

Electron Density:

r_electron=6.43 gm/cc
note: r_Behierite=7.37 gm/cc.

Fermion Index

Fermion Index = 0.0094
Boson Index = 0.9906

Photoelectric:

PE_Behierite= 701.21 barns/electron
U=PE_Behierite x r_electron=4,510.27 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Behierite is Not Radioactive

Behierite Classification

Dana Class:

24.1.2.1 (24)Borates - Anhydrous

(24.1)where (A)2 XO4

(24.1.2)Dana Group

24.1.2.1 Behierite (Ta,Nb)BO4 I 4₁/amd 4/m 2/m 2/m

24.1.2.2 Schiavinatoite! (Nb,Ta)BO4 I 4₁/amd 4/m 2/m 2/m

Strunz Class:

V/G.07-20 V - Nitrates, Carbonates and Borates

V/G - "Insel" borates [BO4]5- tetraheders

V/G.07 - Sinhalite - Behierite series

V/G.07-10 Sinhalite MgAlBO4 Pbmm 2/m 2/m 2/m

V/G.07-12 Pseudosinhalite! Mg2Al3B2O9(OH) P 2₁/c 2/m

V/G.07-20 Behierite (Ta,Nb)BO4 I 4₁/amd 4/m 2/m 2/m

Other Behierite Information

References:

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

See Also:

Links to other databases for Behierite :
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 -École des Mines de Paris

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

Behierite

(Ta,Nb)BO4
Dana No: 24.1.2.1 Strunz No: V/G.07-20
Locality:

Notes: