Bonaccordite Mineral Data

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General Bonaccordite Information

Chemical Formula:

Ni2Fe+++BO5

Composition:

Molecular Weight = 264.03 gm

Iron 21.15 % Fe 30.24 % Fe₂O₃

Nickel 44.46 % Ni 56.58 % NiO

Boron 4.09 % B 13.18 % B₂O₃

Oxygen 30.30 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ni₂Fe³⁺BO₅

Environment:

Small tabular body of nickeliferous serpentinite, probably a contact deposit, along the junction of quartzite and an ultramafic intrusive. Possibly because of a nickel-rich meteorit e impact.

IMA Status:

Approved IMA 1974

Locality:

Three km west of the Scotia talc mine, Bon Accord area, Barberton, Transvaal, South Africa. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Name Pronunciation:

Bonaccordite + Pronunciation

Synonym:

ICSD 71193

PDF 29-939

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Bonaccordite Crystallography

Axial Ratios:

a:b:c =0.7533:1:0.2454

Cell Dimensions:

a = 9.213, b = 12.229, c = 3.001, Z = 4; V = 338.11 Den(Calc)= 5.19

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pbam

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

By Intensity(I/I_o): 2.514(1), 2.548(1), 5.1(0.5),

Crystal Structure:

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Perkins D A , Attfield J P , Journal of the Chemical Society, Chemical Communications , 1991 (1991) p.229-231, Resonant powder X-ray determination of the cation distribution in FeNi2BO5, Locality: synthetic

Physical Properties of Bonaccordite

Color:

Reddish brown.

Density:

5.17

Diaphaneity:

Opaque

Hardness:

7 - Quartz

Luster:

Vitreous - Adamantine

Streak:

brown

Optical Properties of Bonaccordite

Optical Data:

NCalc= 2.16 - from Gladstone-Dale relationship (KC = 0.2232) where Ncalc=Dcalc*KC+1
NCalc= 2.15 - from Gladstone-Dale relationship (KC = 0.2232) where Ncalc=Dmeas*KC+1

Calculated Properties of Bonaccordite

Electron Density:

Bulk Density (Electron Density)=4.99 gm/cc
note: Specific Gravity of Bonaccordite =5.19 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Bonaccordite= 24.37 barns/electron
U=PE_Bonaccordite x rElectron Density= 121.65 barns/cc.

Radioactivity:

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

Bonaccordite Classification

Dana Class:

24.02.01.04 (24)Borates - Anhydrous

(24.02)where (A)2 BO2 [XO3]

(24.02.01)Ludwigite Group (Space Group: Pbam)

24.02.01.01 Ludwigite Mg2FeBO5 Pbam 2/m 2/m 2/m

24.02.01.02 Vonsenite Fe2FeBO5 Pbam 2/m 2/m 2/m

24.02.01.03 Azoproite (Mg,Fe)2(Fe,Ti,Mg)BO5 Pbam 2/m 2/m 2/m

24.02.01.04 Bonaccordite Ni2FeBO5 Pbam 2/m 2/m 2/m

24.02.01.05 Chestermanite Mg2(Fe,Mg,Al,Sb)BO3O2 Pbam 2/m 2/m 2/m

24.02.01.06 Fredrikssonite Mg2(Mn,Fe)O2(BO3) Pbam 2/m 2/m 2/m

Strunz Class:

06.AB.30 06 - BORATES

06.A - Monoborates

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

06.AB.30 Azoproite (Mg,Fe)2(Fe,Ti,Mg)BO5 Pbam 2/m 2/m 2/m

06.AB.30 Bonaccordite Ni2FeBO5 Pbam 2/m 2/m 2/m

06.AB.30 Fredrikssonite Mg2(Mn,Fe)O2(BO3) Pbam 2/m 2/m 2/m

06.AB.30 Ludwigite Mg2FeBO5 Pbam 2/m 2/m 2/m

06.AB.30 Vonsenite Fe2FeBO5 Pbam 2/m 2/m 2/m

Other Bonaccordite Information

References:

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

See Also:

Links to other databases for Bonaccordite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - MinMax(Deutsch)
11 - MinMax(English)
12 - Mineralienatlas (Deutsch)
13 - QUT Mineral Atlas
14 - Ruff.Info

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

Bonaccordite

Ni2Fe+++BO5
Dana No: 24.02.01.04 Strunz No: 06.AB.30
Locality:

Notes: