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Tantalowodginite

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About TantalowodginiteHide

Formula:
(Mn2+0.50.5)TaTa2O8
Colour:
Orange-red to deep red
Lustre:
Sub-Adamantine, Vitreous
Hardness:
5 - 5½
Specific Gravity:
7.61
Crystal System:
Monoclinic
Member of:
Name:
Named for the composition and its relation to wodginite.
The name tantalowodginite was earlier, in 1984, proposed for a new mineral in the wodginite group (Ercit et al. 1984). However this was formally retracted by the same authors recognizing that the type specimen was a Ta-rich wodginite and lithiowodginite (Ercit et al. 1992).
In 2018 IMA approved a new species with the name tantalowodginite.
At the type locality, Emmons pegmatite, tantalowodginite is rimmed with either black wodginite or columbite-(Mn).


Classification of TantalowodginiteHide

Approved
Notes:
Redefined by the IMA
Approval Year:
2018
Approval History:
IMA No. 2017-095

Physical Properties of TantalowodginiteHide

Sub-Adamantine, Vitreous
Colour:
Orange-red to deep red
Streak:
Yellowish-tan
Hardness:
5 - 5½ on Mohs scale
Tenacity:
Brittle
Cleavage:
Distinct/Good
on {100}
Fracture:
Conchoidal
Density:
7.61 g/cm3 (Measured)    7.87 g/cm3 (Calculated)

Optical Data of TantalowodginiteHide

Type:
Biaxial (+)
Dispersion:
Strong
Pleochroism:
Weak
Comments:
Weak to moderate pleochroism: orangish-yellow parallel to cleavage and greenish-yellow perpendicular to cleavage on (010)

Chemical Properties of TantalowodginiteHide

Formula:
(Mn2+0.50.5)TaTa2O8

Crystallography of TantalowodginiteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/b
Setting:
C2/c
Cell Parameters:
a = 9.542(1) Å, b = 11.488(2) Å, c = 5.128(1) Å
β = 91.13(1)°
Ratio:
a:b:c = 0.831 : 1 : 0.446
Unit Cell V:
562.01 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Anhedral masses, rarely as crystals

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
7.332(20)
4.741(20)
3.838(30)
3.667(100)
3.000(100)
2.957(100)
2.883(30)
1.778(30)

Occurrences of TantalowodginiteHide

Paragenetic Mode(s):

Type Occurrence of TantalowodginiteHide

General Appearance of Type Material:
As anhedral masses (0.5–12 cm) in the pegmatite core and crystals (rare) in miarolitic cavities
Place of Conservation of Type Material:
Mineralogical collections of the Maine Mineral and Gem Museum, 99 Main Street, Bethel, Maine, USA, catalogue number MMGM-MP2-12-10-2016
Chemical Analysis of Type Material:
Li2O0.54 %
FeO0.23 %
MnO6.23 %
TiO20.01 %
SnO28.14 %
Nb2O53.97 %
Ta2O580.75 %
Total:99.87 %
Geological Setting of Type Material:
Granite pegmatite
Associated Minerals at Type Locality:
Reference:
Hanson, S.L., Falster, A.U., Simmons, W.B."S"., Sprague, R., Vignola, P., Rotiroti, N., Andó, S., Hatert, F. (2018): Tantalowodginite, (Mn0.5□0.5)TaTa2O8, a New Mineral Species from the Emmons Pegmatite, Uncle Tom Mountain, Maine, U.S.A. Canadian Mineralogist, 56: 543-553.

Synonyms of TantalowodginiteHide

Other Language Names for TantalowodginiteHide

Relationship of Tantalowodginite to other SpeciesHide

Member of:
Other Members of this group:
Achalaite(Fe2+,Mn)(Ti,Fe3+,Ta)(Nb,Ta)2O8Mon. 2/m : B2/b
FerrotitanowodginiteFe2+TiTa2O8Mon.
FerrowodginiteFe2+Sn4+Ta2O8Mon.
LithiotantiteLiTa3O8Mon.
LithiowodginiteLiTa3O8Mon.
TitanowodginiteMn2+TiTa2O8Mon.
WodginiteMn2+Sn4+Ta2O8Mon.

Fluorescence of TantalowodginiteHide

Non-fluorescent under 254 nm (short wave) and 366 nm (long wave) ultraviolet light

Other InformationHide

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

References for TantalowodginiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Ercit, T. S., Černý, P., Hawthorne, F. C. (1984) Wodginite crystal chemistry. Geol. Soc. Am., Abstr. Programs 16, 502.
Ercit, T. S., Černý, P., Hawthorne, F. C (1992) The wodginite group. III. Classification and new species: The Canadian Mineralogist 30: 633-638
Hanson, S.L., Falster, A.U., Simmons, W.B., Sprague, R., Vignola, P., Rotiroti, N., Andó, S. and Hatert, F. (2018) Tantalowodginite, IMA 2017-095. CNMNC Newsletter No. 41, February 2018, page page 184; European Journal of Mineralogy: 30: 183-186
Hanson, S.L., Falster, A.U., Simmons, W.B."S"., Sprague, R., Vignola, P., Rotiroti, N., Andó, S., Hatert, F. (2018): Tantalowodginite, (Mn0.5□0.5)TaTa2O8, a New Mineral Species from the Emmons Pegmatite, Uncle Tom Mountain, Maine, U.S.A. Canadian Mineralogist, 56: 543-553.

Internet Links for TantalowodginiteHide

Localities for TantalowodginiteHide

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

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
USA (TL)
 
  • Maine
    • Oxford Co.
      • Greenwood
        • Uncle Tom Mountain
Hanson, S.L., Falster, A.U., Simmons, W.B., Sprague, R., Vignola, P., Rotiroti, N., Andó, S. and Hatert, F. (2018) Tantalowodginite, IMA 2017-095. CNMNC Newsletter No. 41, February 2018, page page 184; European Journal of Mineralogy: 30: 183-186; Hanson, S.L., Falster, A.U., Simmons, W.B."S"., Sprague, R., Vignola, P., Rotiroti, N., Andó, S., Hatert, F. (2018): Tantalowodginite, (Mn0.5□0.5)TaTa2O8, a New Mineral Species from the Emmons Pegmatite, Uncle Tom Mountain, Maine, U.S.A. Canadian Mineralogist, 56: 543-553.
Mineral and/or Locality  
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