Bobfergusonite (original) (raw)

A valid IMA mineral species

About BobfergusoniteHide

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Colour:

Green-brown to red-brown

Lustre:

Sub-Vitreous, Resinous, Greasy

Crystal System:

Monoclinic

Name:

Named by T. Scott Ercit, A. J. Anderson, Petr Cerny, and Frank C. Hawthorne in honor of Robert Bury Ferguson [February 5, 1921- Jan 18, 2015], Professor of Mineralogy, University of Manitoba, Canada.

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:700:9

f050b398-f73d-4e4c-88c9-54c90a2be234

IMA Classification of BobfergusoniteHide

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IMA Formula:

◻Na2Mn2+5Fe3+Al(PO4)6

Type description reference:

Ercit, T. S., Anderson, A. J., Černý, P., Hawthorne, F. C. (1986) Bobfergusonite, a new phosphate mineral from Cross Lake, Manitoba. The Canadian Mineralogist, 24 (4) 599-604

Classification of BobfergusoniteHide

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8.AC.15

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

38.2.4.5

38 : ANHYDROUS NORMAL PHOSPHATES, ARSENATES, AND VANADATES
2 : (AB)5(XO4)3

19.12.58

19 : Phosphates
12 : Phosphates of Mn

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.

Physical Properties of BobfergusoniteHide

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Sub-Vitreous, Resinous, Greasy

Comment:

Bronzy on parting planes.

Colour:

Green-brown to red-brown

Cleavage:

Perfect
Perfect on {010}, {100} good.

Fracture:

Irregular/Uneven

Density:

3.54(1) g/cm3 (Measured) 3.57 g/cm3 (Calculated)

Optical Data of BobfergusoniteHide

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RI values:

_n_α = 1.694(1) _n_β = 1.698(1) _n_γ = 1.715(2)

2V:

Measured: 46° , Calculated: 52°

δ = 0.021

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

Dispersion:

relatively strong

Optical Extinction:

Y || b, X ^ a = + 10°

Comments:

X=Y= Yellow-orange
Z= Orange
Z>X = Y

Chemistry of BobfergusoniteHide

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Mindat Formula:

Na2Mn5FeAl(PO4)6

Crystallography of BobfergusoniteHide

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Crystal System:

Monoclinic

Class (H-M):

2/m - Prismatic

Cell Parameters:

a = 12.773 Å, b = 12.486 Å, c = 11.038 Å
β = 114.35(13)°

Ratio:

a:b:c = 1.023 : 1 : 0.884

Unit Cell V:

1,603.78 ų (Calculated from Unit Cell)

Morphology:

Equant anhedral crystals to 1cm and nodular aggregates.

Comment:

P21/n, Can Min 24:605 (1986) structure

Crystal StructureHide

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X-Ray Powder DiffractionHide

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Powder Diffraction Data:

Geological EnvironmentHide

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Type Occurrence of BobfergusoniteHide

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Place of Conservation of Type Material:

Royal Ontario Museum, Ottawa, Canada M42687

Geological Setting of Type Material:

Primary mineral in intermediate zone of granitic pegmatite enriched in Mn and F

Reference:

Ercit, T.S., Anderson, A.J., Černý, P., Hawthorne, F.C. (1986) Bobfergusonite, a new phosphate mineral from Cross Lake, Manitoba. The Canadian Mineralogist: 24: 599-604.

Synonyms of BobfergusoniteHide

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Other Language Names for BobfergusoniteHide

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Relationship of Bobfergusonite to other SpeciesHide

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Other Members of this group:

Common AssociatesHide

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Associated Minerals Based on Photo Data:

Related Minerals - Strunz-mindat GroupingHide

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Fluorescence of BobfergusoniteHide

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Other InformationHide

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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 BobfergusoniteHide

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References for BobfergusoniteHide

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Reference List:

Ercit, T. S., Anderson, A. J., Černý, P., Hawthorne, F. C. (1986) Bobfergusonite, a new phosphate mineral from Cross Lake, Manitoba. The Canadian Mineralogist, 24 (4) 599-604

Ercit, T. S., Anderson, A. J., Černý, P., Hawthorne, F. C. (1986) Bobfergusonite, a new phosphate mineral from Cross Lake, Manitoba. The Canadian Mineralogist, 24 (4) 599-604

**Hawthorne, Frank C., Burke, Ernst A. J., Ercit, T. Scott, Grew, Edward S., Grice, Joel D., Jambor, John L., Puziewicz, Jacek, Roberts, Andrew C., Vanko, David A. (1988) New Mineral Names. American Mineralogist, 73 (1-2) 189-199 **p.190

Localities for BobfergusoniteHide

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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.