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Bonaccordite

A valid IMA mineral species

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Bonaccordite

Bon Accord Ni deposit, Barberton, Mbombela Local Municipality, Ehlanzeni District Municipality, Mpumalanga, South Africa

Bonaccordite

Bon Accord Ni deposit, Barberton, Mbombela Local Municipality, Ehlanzeni District Municipality, Mpumalanga, South Africa

Bonaccordite, etc.

Bon Accord Ni deposit, Barberton, Mbombela Local Municipality, Ehlanzeni District Municipality, Mpumalanga, South Africa

Bonaccordite

Bon Accord Ni deposit, Barberton, Mbombela Local Municipality, Ehlanzeni District Municipality, Mpumalanga, South Africa

Bonaccordite

Bon Accord Ni deposit, Barberton, Mbombela Local Municipality, Ehlanzeni District Municipality, Mpumalanga, South Africa

Bonaccordite, etc.

Bon Accord Ni deposit, Barberton, Mbombela Local Municipality, Ehlanzeni District Municipality, Mpumalanga, South Africa

Bonaccordite

Bon Accord Ni deposit, Barberton, Mbombela Local Municipality, Ehlanzeni District Municipality, Mpumalanga, South Africa

Bonaccordite

Bon Accord Ni deposit, Barberton, Mbombela Local Municipality, Ehlanzeni District Municipality, Mpumalanga, South Africa

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About BonaccorditeHide

Formula:

Ni₂Fe³⁺(BO₃)O₂

Colour:

Reddish-brown, light grey

Hardness:

Specific Gravity:

5.17 (Calculated)

Crystal System:

Orthorhombic

Member of:

Ludwigite Group

Name:

Named for the type locality at Bon Accord, South Africa.

Type Locality:

ⓘ Bon Accord Ni deposit, Barberton, Mbombela Local Municipality, Ehlanzeni District Municipality, Mpumalanga, South Africa

This page provides mineralogical data about Bonaccordite.

Unique IdentifiersHide

Mindat ID:

717

Long-form identifier:

mindat:1:1:717:9

IMA Classification of BonaccorditeHide

IMA status:

Approved

IMA Formula:

Ni²⁺₂Fe³⁺O₂(BO₃)

Approval year:

1974

First published:

1974

Type description reference:

De Waal, S.A., Viljoen, E.A., Calk, L.C. (1974) Nickel minerals from Barberton, South Africa: VII. Bonaccordite, the nickel analogue of ludwigite. Transactions of the Geological Society of South Africa: 77: 375-375.

Classification of BonaccorditeHide

Strunz-mindat (2026):

6.AB.30

6 : BORATES
A : Monoborates
B : BO₃, with additional anions; 1(D) + OH, etc.

Dana 8th ed.:

24.2.1.4

24 : ANHYDROUS BORATES
2 : A₂BO₂[XO₃]

Hey's CIM Ref.:

9.9.1

9 : Borates
9 : Borates of Ni

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Symbol	Source	Reference for Standard
Bna	IMA–CNMNC	Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of BonaccorditeHide

Transparency:

Opaque

Colour:

Reddish-brown, light grey

Hardness:

7 on Mohs scale

Hardness:

VHN₁₅=1069 kg/mm² - Vickers

Density:

5.17 g/cm³ (Calculated)

Optical Data of BonaccorditeHide

Anisotropism:

Medium to strong.

Bireflectance:

Distinct, in oil.

Colour in reflected light:

Gray with brownish tinge

Internal Reflections:

Strong reddish brown

Comments:

R1–R2: 14.2–17.6

Chemistry of BonaccorditeHide

Mindat Formula:

Ni₂Fe³⁺(BO₃)O₂

Element Weights:

Element	% weight
Ni	44.458 %
O	30.297 %
Fe	21.150 %
B	4.095 %

Calculated from ideal end-member formula.

Elements listed:

B, Fe, Ni, O - search for minerals with similar chemistry

Crystallography of BonaccorditeHide

Crystal System:

Orthorhombic

Class (H-M):

mmm(2/m2/m2/m) - Dipyramidal

Space Group:

Pbam

Setting:

Pbam

Cell Parameters:

a = 9.213(6) Å, b = 12.229(7) Å, c = 3.001(2) Å

Ratio:

a:b:c = 0.753 : 1 : 0.245

Unit Cell V:

338.11 Å³ (Calculated from Unit Cell)

Comment:

Space Group by analogy to ludwigite group

Crystal StructureHide

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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure

ID	Species	Reference	Link	Year	Locality	Pressure (GPa)	Temp (K)
0014105	Bonaccordite	Perkins D A, Attfield J P (1991) Resonant powder X-ray determination of the cation distribution in FeNi2BO5 Journal of the Chemical Society, Chemical Communications 1991 229-231		1991	synthetic	0	293

CIF Raw Data - click here to close

data_global
_chemical_name_mineral 'Bonaccordite'
loop_
_publ_author_name
'Perkins D A'
'Attfield J P'
_journal_name_full 'Journal of the Chemical Society, Chemical Communications'
_journal_volume 1991 
_journal_year 1991
_journal_page_first 229
_journal_page_last 231
_publ_section_title
;
 Resonant powder X-ray determination of the cation distribution in FeNi2BO5
;
_database_code_amcsd 0014105
_chemical_compound_source 'Synthetic'
_chemical_formula_sum '(Fe Ni2) B O5'
_cell_length_a 9.21048
_cell_length_b 12.23794
_cell_length_c 3.00620
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 338.851
_exptl_crystal_density_diffrn      5.176
_symmetry_space_group_name_H-M 'P b a m'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '1/2+x,1/2-y,z'
  '1/2-x,1/2+y,-z'
  '1/2-x,1/2+y,z'
  '1/2+x,1/2-y,-z'
  'x,y,-z'
  '-x,-y,z'
  '-x,-y,-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_occupancy
_atom_site_U_iso_or_equiv
FeM1   0.00000   0.00000   0.00000   0.08800   0.00165
NiM1   0.00000   0.00000   0.00000   0.91200   0.00165
FeM2   0.50000   0.00000   0.50000   0.38500   0.00165
NiM2   0.50000   0.00000   0.50000   0.61500   0.00165
FeM3  -0.00010   0.28140   0.00000   0.14400   0.00165
NiM3  -0.00010   0.28140   0.00000   0.85600   0.00165
FeM4   0.73780   0.38480   0.50000   0.61900   0.00165
NiM4   0.73780   0.38480   0.50000   0.38100   0.00165
B   0.27400   0.36020   0.50000   1.00000   0.00380
O1   0.85160   0.04380   0.50000   1.00000   0.00165
O2   0.39100   0.07630   0.00000   1.00000   0.00165
O3   0.62760   0.13940   0.50000   1.00000   0.00165
O4   0.10380   0.14440   0.00000   1.00000   0.00165
O5   0.84970   0.23950   0.50000   1.00000   0.00165

X-Ray Powder DiffractionHide

Powder Diffraction Data:

d-spacing	Intensity
2.548 Å	(100)
2.514 Å	(100)
5.10 Å	(50)
1.898 Å	(50)
4.61 Å	(40)
2.334 Å	(35)
2.025 Å	(35)

Locality:

Bon Accord Ni deposit, Barberton, Mbombela Local Municipality, Ehlanzeni District Municipality, Mpumalanga, South Africa

Reference:

Geological EnvironmentHide

Paragenetic Mode(s):

Paragenetic Mode	Earliest Age (Ga)
Near-surface Processes
23 : Subaerial aqueous alteration by non-redox-sensitive fluids (see also #47)
Stage 7: Great Oxidation Event	<2.4
47i : [Terrestrial weathering of meteorites]

Type Occurrence of BonaccorditeHide

Type Locality:

ⓘ Bon Accord Ni deposit, Barberton, Mbombela Local Municipality, Ehlanzeni District Municipality, Mpumalanga, South Africa

General Appearance of Type Material:

Clusters of slender prisms up to 400x30 microns, forming veins in other minerals, and as rosette-like radiating groups in liebenbergite and trevorite.

Place of Conservation of Type Material:

Royal Ontario Museum, Toronto, Ontario, Canada, M33443.
National Museum of Natural History (Smithsonian), Washington, D.C., USA, 132463.

Geological Setting of Type Material:

Tabular body of nickeliferous serpentinite.

Associated Minerals at Type Locality:

Bunsenite	Gaspéite	Liebenbergite	Millerite	Népouite
Nimite	Trevorite	Violarite

Reference:

Bonaccordite

About BonaccorditeHide

Unique IdentifiersHide

IMA Classification of BonaccorditeHide

Classification of BonaccorditeHide

Mineral SymbolsHide

Physical Properties of BonaccorditeHide

Optical Data of BonaccorditeHide

Chemistry of BonaccorditeHide

Crystallography of BonaccorditeHide

Crystal StructureHide

X-Ray Powder DiffractionHide

Geological EnvironmentHide

Type Occurrence of BonaccorditeHide

Synonyms of Bonaccordite