Ferrobobfergusonite (original) (raw)

A valid IMA mineral species

Formula:

Na2Fe2+5Fe3+Al(PO4)6

Crystal System:

Monoclinic

The ferrous iron analogue of bobfergusonite.

The cations located at the M sites are strongly ordered, over the six available sites; _M_1, _M_2, _M_3, and _M_4 are mainly dominantly by Fe2+, while _M_5 and _M_6 by Fe3+ and Al, respectively.

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:51833:8

ef6e9a50-e0a3-41fd-916e-9155d05623b9

IMA Classification of FerrobobfergusoniteHide

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IMA Formula:

◻Na2Fe2+5Fe3+Al(PO4)6

Type description reference:

Yang, Hexiong, Yong, Tommy, Downs, Robert T. (2021) Ferrobobfergusonite, □Na2Fe2+5Fe3+Al(PO4)6, a new mineral of the bobfergusonite group from the Victory Mine, Custer County, South Dakota, USA. The Canadian Mineralogist, 59 (3) 617-627 doi:10.3749/canmin.2000064

Classification of FerrobobfergusoniteHide

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8.AC.07

8 : PHOSPHATES, ARSENATES, VANADATES
A : Phosphates, etc. without additional anions, without H2O
C : With medium-sized and large cations

Mineral SymbolsHide

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

Pronunciation of FerrobobfergusoniteHide

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Pronunciation:

Physical Properties of FerrobobfergusoniteHide

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Parting:

not observed (macroscopically)

Density:

3.68(1) g/cm3 (Measured) 3.69 g/cm3 (Calculated)

Optical Data of FerrobobfergusoniteHide

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RI values:

_n_α = 1.698(2) _n_β = 1.705(2) _n_γ = 1.727(2)

2V:

Measured: 65° (2), Calculated: 60°

δ = 0.029

Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.

Dispersion:

very strong, r > v

Comments:

X = yellowish brown, Y = brown, and Z = deep brown

Comments:

optical axes orientation: α ∧ X = 16°, β = Y

Chemistry of FerrobobfergusoniteHide

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Mindat Formula:

Na2Fe2+5Fe3+Al(PO4)6

Crystallography of FerrobobfergusoniteHide

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Crystal System:

Monoclinic

Cell Parameters:

a = 12.7156(3) Å, b = 12.3808(3) Å, c = 10.9347(3) Å
β = 97.3329(10)°

Ratio:

a:b:c = 1.027 : 1 : 0.883

Unit Cell V:

1,707.36 ų (Calculated from Unit Cell)

Twinning:

not observed (macroscopically)

X-Ray Powder DiffractionHide

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Powder Diffraction Data:

Comments:

From Type Description.

Geological EnvironmentHide

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Type Occurrence of FerrobobfergusoniteHide

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General Appearance of Type Material:

as broken pieces of blocky or tabular habit, where single crystals are up to 0.9 × 0.7 × 0.4 mm in size

Place of Conservation of Type Material:

Type material is deposited in the collections of the Mineral Museum of the University of Arizona, Tucson, USA, catalogue # 21437, and the RRUFF Project, deposition # R140993

Associated Minerals at Type Locality:

Reference:

Yang, H., Yong, T., Downs, R.T. (2021) Ferrobobfergusonite, ☐Na2Fe2+5Fe3+Al(PO4)6, a new mineral of the bobfergusonite group, from the Victory Mine, Custer County, South Dakota, USA. The Canadian Mineralogist: 59(3): 617–627.

Synonyms of FerrobobfergusoniteHide

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Relationship of Ferrobobfergusonite to other SpeciesHide

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Other Members of this group:

Related Minerals - Strunz-mindat GroupingHide

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Other InformationHide

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Notes:

calc. compatibility index based on the empirical formula: 0.017 (superior)

Health Risks:

No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Internet Links for FerrobobfergusoniteHide

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References for FerrobobfergusoniteHide

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Reference List:

Yang, Hexiong, Yong, Tommy, Downs, Robert T. (2021) Ferrobobfergusonite, □Na2Fe2+5Fe3+Al(PO4)6, a new mineral of the bobfergusonite group from the Victory Mine, Custer County, South Dakota, USA. The Canadian Mineralogist, 59 (3) 617-627 doi:10.3749/canmin.2000064

Localities for FerrobobfergusoniteHide

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This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

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- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.