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Tapiolite-(Fe)
A valid IMA mineral species - grandfathered
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About Tapiolite-(Fe)
Formula:
Fe2+Ta2O6
Colour:
Black
Lustre:
Sub-Adamantine, Metallic, Sub-Metallic
Hardness:
6 - 6½
Specific Gravity:
7.90
Crystal System:
Tetragonal
Member of:
Name:
Nils Adolf Erik Nordenskiöld named tapiolite in 1863 after Tapio, Finnish god of the forest as the original material was from a granite pegmatite prospect located close to the Kumala farm in the town of Sukula in Finland. Renamed to ferrotapiolite in 1983 to distinguish it from manganotapiolite. Later renamed to tapiolite-(Fe).
Type Locality:
Dimorph of:
Unique Identifiers
Mindat ID:
1531
Long-form identifier:
mindat:1:1:1531:4
Similar Names
| Tapiolite | (Fe,Mn)(Ta,Nb)2O6 | |
| Tapiolite-(Fe)-Tapiolite-(Mn) Series | A solid-solution series between two end-member minerals | |
| Tapiolite-(Mn) | A valid IMA mineral species | Mn2+Ta2O6 |
IMA Classification of Tapiolite-(Fe)
Approved, 'Grandfathered' (first described prior to 1959)
IMA Formula:
Fe2+Ta5+2O6
First published:
1863
Classification of Tapiolite-(Fe)
4.DB.10
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
D : Metal: Oxygen = 1:2 and similar
B : With medium-sized cations; chains of edge-sharing octahedra
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
D : Metal: Oxygen = 1:2 and similar
B : With medium-sized cations; chains of edge-sharing octahedra
8.3.1.1
8 : MULTIPLE OXIDES CONTAINING NIOBIUM,TANTALUM OR TITANIUM
3 : AB2O6
8 : MULTIPLE OXIDES CONTAINING NIOBIUM,TANTALUM OR TITANIUM
3 : AB2O6
18.1.47
18 : Niobates and Tantalates
1 : Niobates and tantalates containing neither rare earths nor U
18 : Niobates and Tantalates
1 : Niobates and tantalates containing neither rare earths nor U
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.
Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Tap-Fe | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
| Tap | The Canadian Mineralogist (2019) | The Canadian Mineralogist (2019) The Canadian Mineralogist list of symbols for rock- and ore-forming minerals (December 30, 2019). download |
Physical Properties of Tapiolite-(Fe)
Sub-Adamantine, Metallic, Sub-Metallic
Transparency:
Opaque
Colour:
Black
Streak:
Brownish black
Hardness:
6 - 6½ on Mohs scale
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
Irregular/Uneven, Splintery
Density:
7.90 g/cm3 (Measured) 8.17 g/cm3 (Calculated)
Optical Data of Tapiolite-(Fe)
Type:
Uniaxial (+)
RI values:
nω = 2.27 nε = 2.42
Birefringence:
0.15
Max. Birefringence:
δ = 0.150
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
Very High (positive)
Relative to Canada balsam mounting medium (n ≈ 1.537).
Relative to Canada balsam mounting medium (n ≈ 1.537).
This shows the grain boundary and Becke line effect under plane-polarised
light, based on the contrast between this mineral's average refractive
index and the mounting medium. It does not take into account mineral
colouration.
In focus
Interference Figure:
This shows the idealized uniaxial interference figure - the conoscopic
(convergent-light, Bertrand-lens-in) view, for a grain cut with the optic axis
centred and vertical. The coloured rings are isochromatics, computed with the
same physics as the Michel-Lévy bar above; the dark cross is the isogyre.
For a genuinely uniaxial mineral viewed this way, that cross stays perfectly stationary if you rotate the stage - unlike a biaxial mineral, where it splits apart on rotation. That invariance is itself the standard diagnostic test for telling uniaxial and biaxial minerals apart at the microscope.
For a genuinely uniaxial mineral viewed this way, that cross stays perfectly stationary if you rotate the stage - unlike a biaxial mineral, where it splits apart on rotation. That invariance is itself the standard diagnostic test for telling uniaxial and biaxial minerals apart at the microscope.
Optical Extinction:
Parallel
Pleochroism:
Strong
Comments:
O = pale reddish brown, E nearly opaque
Chemistry of Tapiolite-(Fe)
Mindat Formula:
Fe2+Ta2O6
Element Weights:
Elements listed:
Crystallography of Tapiolite-(Fe)
Crystal System:
Tetragonal
Class (H-M):
4/mmm(4/m2/m2/m) - Ditetragonal Dipyramidal
Space Group:
P42/mnm
Cell Parameters:
a = 4.762 Å, c = 9.272 Å
Ratio:
a:c = 1 : 1.947
Unit Cell V:
210.26 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Short prismatic, nearly equant, rarely elongated. {110}, {100}, {001}, {113}.
Twinning:
{013} common
Crystal Structure
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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) |
|---|---|---|---|---|---|---|---|
| 0018725 | Tapiolite-(Fe) | Zema M, Tarantino S C, Giorgiani A (2006) Structural changes induced by cation ordering in ferrotapiolite Mineralogical Magazine 70 319-328 | 2006 | Kimito, Finland | 0 | 293 | |
| 0018724 | Tapiolite-(Fe) | Zema M, Tarantino S C, Giorgiani A (2006) Structural changes induced by cation ordering in ferrotapiolite Mineralogical Magazine 70 319-328 | 2006 | Kimito, Finland | 0 | 293 | |
| 0018723 | Tapiolite-(Fe) | Zema M, Tarantino S C, Giorgiani A (2006) Structural changes induced by cation ordering in ferrotapiolite Mineralogical Magazine 70 319-328 | 2006 | Kimito, Finland | 0 | 293 | |
| 0018722 | Tapiolite-(Fe) | Zema M, Tarantino S C, Giorgiani A (2006) Structural changes induced by cation ordering in ferrotapiolite Mineralogical Magazine 70 319-328 | 2006 | Kimito, Finland | 0 | 293 | |
| 0018721 | Tapiolite-(Fe) | Zema M, Tarantino S C, Giorgiani A (2006) Structural changes induced by cation ordering in ferrotapiolite Mineralogical Magazine 70 319-328 | 2006 | Kimito, Finland | 0 | 293 | |
| 0018720 | Tapiolite-(Fe) | Zema M, Tarantino S C, Giorgiani A (2006) Structural changes induced by cation ordering in ferrotapiolite Mineralogical Magazine 70 319-328 | 2006 | Kimito, Finland | 0 | 293 | |
| 0018719 | Tapiolite-(Fe) | Zema M, Tarantino S C, Giorgiani A (2006) Structural changes induced by cation ordering in ferrotapiolite Mineralogical Magazine 70 319-328 | 2006 | Kimito, Finland | 0 | 293 | |
| 0018718 | Tapiolite-(Fe) | Zema M, Tarantino S C, Giorgiani A (2006) Structural changes induced by cation ordering in ferrotapiolite Mineralogical Magazine 70 319-328 | 2006 | Kimito, Finland | 0 | 293 | |
| 0018717 | Tapiolite-(Fe) | Zema M, Tarantino S C, Giorgiani A (2006) Structural changes induced by cation ordering in ferrotapiolite Mineralogical Magazine 70 319-328 | 2006 | Kimito, Finland | 0 | 293 | |
| 0018716 | Tapiolite-(Fe) | Zema M, Tarantino S C, Giorgiani A (2006) Structural changes induced by cation ordering in ferrotapiolite Mineralogical Magazine 70 319-328 | 2006 | Kimito, Finland | 0 | 293 | |
| 0018715 | Tapiolite-(Fe) | Zema M, Tarantino S C, Giorgiani A (2006) Structural changes induced by cation ordering in ferrotapiolite Mineralogical Magazine 70 319-328 | 2006 | Kimito, Finland | 0 | 293 | |
| 0018714 | Tapiolite-(Fe) | Zema M, Tarantino S C, Giorgiani A (2006) Structural changes induced by cation ordering in ferrotapiolite Mineralogical Magazine 70 319-328 | 2006 | Kimito, Finland | 0 | 293 | |
| 0018713 | Tapiolite-(Fe) | Zema M, Tarantino S C, Giorgiani A (2006) Structural changes induced by cation ordering in ferrotapiolite Mineralogical Magazine 70 319-328 | 2006 | Kimito, Finland | 0 | 293 | |
| 0018712 | Tapiolite-(Fe) | Zema M, Tarantino S C, Giorgiani A (2006) Structural changes induced by cation ordering in ferrotapiolite Mineralogical Magazine 70 319-328 | 2006 | Kimito, Finland | 0 | 293 | |
| 0018711 | Tapiolite-(Fe) | Zema M, Tarantino S C, Giorgiani A (2006) Structural changes induced by cation ordering in ferrotapiolite Mineralogical Magazine 70 319-328 | 2006 | Kimito, Finland | 0 | 293 | |
| 0018710 | Tapiolite-(Fe) | Zema M, Tarantino S C, Giorgiani A (2006) Structural changes induced by cation ordering in ferrotapiolite Mineralogical Magazine 70 319-328 | 2006 | Kimito, Finland | 0 | 293 | |
| 0018709 | Tapiolite-(Fe) | Zema M, Tarantino S C, Giorgiani A (2006) Structural changes induced by cation ordering in ferrotapiolite Mineralogical Magazine 70 319-328 | 2006 | Kimito, Finland | 0 | 293 | |
| 0018708 | Tapiolite-(Fe) | Zema M, Tarantino S C, Giorgiani A (2006) Structural changes induced by cation ordering in ferrotapiolite Mineralogical Magazine 70 319-328 | 2006 | Kimito, Finland | 0 | 293 | |
| 0018707 | Tapiolite-(Fe) | Zema M, Tarantino S C, Giorgiani A (2006) Structural changes induced by cation ordering in ferrotapiolite Mineralogical Magazine 70 319-328 | 2006 | Kimito, Finland | 0 | 293 | |
| 0018706 | Tapiolite-(Fe) | Zema M, Tarantino S C, Giorgiani A (2006) Structural changes induced by cation ordering in ferrotapiolite Mineralogical Magazine 70 319-328 | 2006 | Kimito, Finland | 0 | 293 | |
| 0018705 | Tapiolite-(Fe) | Zema M, Tarantino S C, Giorgiani A (2006) Structural changes induced by cation ordering in ferrotapiolite Mineralogical Magazine 70 319-328 | 2006 | Kimito, Finland | 0 | 293 | |
| 0018704 | Tapiolite-(Fe) | Zema M, Tarantino S C, Giorgiani A (2006) Structural changes induced by cation ordering in ferrotapiolite Mineralogical Magazine 70 319-328 | 2006 | Kimito, Finland | 0 | 293 | |
| 0018703 | Tapiolite-(Fe) | Zema M, Tarantino S C, Giorgiani A (2006) Structural changes induced by cation ordering in ferrotapiolite Mineralogical Magazine 70 319-328 | 2006 | Kimito, Finland | 0 | 293 | |
| 0018702 | Tapiolite-(Fe) | Zema M, Tarantino S C, Giorgiani A (2006) Structural changes induced by cation ordering in ferrotapiolite Mineralogical Magazine 70 319-328 | 2006 | Kimito, Finland | 0 | 293 | |
| 0018701 | Tapiolite-(Fe) | Zema M, Tarantino S C, Giorgiani A (2006) Structural changes induced by cation ordering in ferrotapiolite Mineralogical Magazine 70 319-328 | 2006 | Kimito, Finland | 0 | 293 | |
| 0018700 | Tapiolite-(Fe) | Zema M, Tarantino S C, Giorgiani A (2006) Structural changes induced by cation ordering in ferrotapiolite Mineralogical Magazine 70 319-328 | 2006 | Kimito, Finland | 0 | 293 | |
| 0018647 | Tapiolite-(Fe) | Peters E, Muller-Buschbaum H (1995) Hochtemperatursynthese und Kristallchemie der Oxotantalate Cr2+0.761Ta2.095O6 und FeTa2O6 Zeitschrift fur Naturforschung B50 712-716 | 1995 | synthetic | 0 | 293 | |
| 0013576 | Tapiolite-(Fe) | Eicher S M, Greedan J E, Lushington K J (1986) The magnetic properties of FeTa2O6. Magnetic structure and low-dimensional behavior Journal of Solid State Chemistry 62 220-230 | 1986 | synthetic | 0 | 293 | |
| 0017875 | Tapiolite-(Fe) | von Heidenstam O (1968) Neutron and X-ray diffraction studies on tapiolite and some synthetic substances of trirutile structure Arkiv for Kemi 28 375-387 | 1968 | 0 | 293 | ||
| 0017874 | Tapiolite-(Fe) | von Heidenstam O (1968) Neutron and X-ray diffraction studies on tapiolite and some synthetic substances of trirutile structure Arkiv for Kemi 28 375-387 | 1968 | 0 | 293 | ||
| 0017873 | Tapiolite-(Fe) | von Heidenstam O (1968) Neutron and X-ray diffraction studies on tapiolite and some synthetic substances of trirutile structure Arkiv for Kemi 28 375-387 | 1968 | 0 | 293 | ||
| 0017872 | Tapiolite-(Fe) | von Heidenstam O (1968) Neutron and X-ray diffraction studies on tapiolite and some synthetic substances of trirutile structure Arkiv for Kemi 28 375-387 | 1968 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 4.22 Å | (30) |
| 3.36 Å | (100) |
| 2.58 Å | (90) |
| 2.38 Å | (30) |
| 1.746 Å | (70) |
| 1.680 Å | (30) |
| 1.502 Å | (20) |
| 1.407 Å | (30) |
Comments:
23-1124
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 4b: Highly evolved igneous rocks | >3.0 |
| 34 : Complex granite pegmatites |
Geological Setting:
Granite pegmatites
Type Occurrence of Tapiolite-(Fe)
Geological Setting of Type Material:
Granite pegmatites.
Synonyms of Tapiolite-(Fe)
Tantalo-niobate (in part)
Other Language Names for Tapiolite-(Fe)
Dutch:Tapioliet-(Fe)
German:Tapiolit-(Fe)
Ferrotapiolit
Ferrotapiolit
Russian:Ферротапиолит
Simplified Chinese:重钽铁矿
Spanish:Ferrotapiolita
Relationship of Tapiolite-(Fe) to other Species
Member of:
Other Members of Tapiolite Group:
| Tapiolite-(Mn) | Mn2+Ta2O6 | Tet. 4/mmm(4/m2/m2/m) : P42/mnm |
Forms a series with:
Common Associates
Associations Based on Photo Data:
| 30 photos of Tapiolite-(Fe) associated with Quartz | SiO2 |
| 25 photos of Tapiolite-(Fe) associated with Muscovite | KAl2(AlSi3O10)(OH)2 |
| 10 photos of Tapiolite-(Fe) associated with Albite | Na(AlSi3O8) |
| 4 photos of Tapiolite-(Fe) associated with Microcline | K(AlSi3O8) |
| 4 photos of Tapiolite-(Fe) associated with Stibiotantalite | Sb3+TaO4 |
| 3 photos of Tapiolite-(Fe) associated with Tantalite-(Mn) | Mn2+Ta2O6 |
| 3 photos of Tapiolite-(Fe) associated with Simpsonite | Al4Ta3O13(OH) |
| 2 photos of Tapiolite-(Fe) associated with Zircon | Zr(SiO4) |
| 2 photos of Tapiolite-(Fe) associated with Goethite | Fe3+O(OH) |
| 2 photos of Tapiolite-(Fe) associated with Mica Group |
Related Minerals - Strunz-mindat Grouping
| 4.DB. | Tianhongqiite | CrTiO3(OH) |
| 4.DB. | Nioboheftetjernite | ScNbO4 |
| 4.DB. | Huangshanite | Fe3+TaO4 |
| 4.DB. | Nioboixiolite-(Mn2+) | (Nb0.67Mn2+0.33)O2 |
| 4.DB. | Shakhdaraite-(Y) | ScYNb2O8 |
| 4.DB.05 | Varlamoffite | Sn1-xFexO2-x(OH) |
| 4.DB.05 | Argutite | GeO2 |
| 4.DB.05 | Cassiterite | SnO2 |
| 4.DB.05 | Rutile | TiO2 |
| 4.DB.05 | Plattnerite | PbO2 |
| 4.DB.05 | Tripuhyite | Fe3+Sb5+O4 |
| 4.DB.05 | Tugarinovite | MoO2 |
| 4.DB.05 | Pyrolusite | Mn4+O2 |
| 4.DB.10 | Byströmite | MgSb2O6 |
| 4.DB.10 | Ordoñezite | ZnSb2O6 |
| 4.DB.10 | Tredouxite | NiSb2O6 |
| 4.DB.10 | Tapiolite-(Mn) | Mn2+Ta2O6 |
| 4.DB.15a | Paramontroseite | V4+O2 |
| 4.DB.15a | Ramsdellite | Mn4+O2 |
| 4.DB.15b | Akhtenskite | ε-Mn4+O2 |
| 4.DB.15c | Nsutite | (Mn4+,Mn2+)(O,OH)2 |
| 4.DB.20 | Scrutinyite | α-PbO2 |
| 4.DB.20 | Nioboixiolite-([]) | (Nb0.8◻0.2)4+O2 |
| 4.DB.25 | Ishikawaite | U4+Fe2+Nb2O8 |
| 4.DB.25 | Yttrocolumbite-(Y) | Y(U4+,Fe2+)Nb2O8 |
| 4.DB.25 | Calciosamarskite | (Ca,U4+)Fe3+(Nb,Ta,Ti)2O8 |
| 4.DB.25 | Samarskite-(Yb) | YbFe3+(Nb,Ta)2O8 |
| 4.DB.25 | Ixiolite-(Sc) | (Ta0.5Sc0.5)O2 |
| 4.DB.25 | Ixiolite-(Fe2+) | (Ta0.67Fe2+0.33)O2 |
| 4.DB.25 | Ixiolite-(Mn2+) | (Ta0.67Mn2+0.33)O2 |
| 4.DB.25 | Nioboixiolite-(Fe2+) | (Nb0.67Fe2+0.33)O2 |
| 4.DB.25 | Srilankite | TiO2 |
| 4.DB.25 | Samarskite-(Y) | YFe3+Nb2O8 |
| 4.DB.25 | Nioboixiolite-(Fe3+) | (Nb0.5Fe3+0.5)O2 |
| 4.DB.30 va | Wolframite Group | |
| 4.DB.30 | Rossovskyite | (Fe3+,Ta)(Nb,Ti)O4 |
| 4.DB.30 | Huanzalaite | MgWO4 |
| 4.DB.30 | Heftetjernite | ScTaO4 |
| 4.DB.30 | Hübnerite | MnWO4 |
| 4.DB.30 | Sanmartinite | (Zn,Fe)WO4 |
| 4.DB.30 | Ferberite | FeWO4 |
| 4.DB.30 | 'Krasnoselskite' | CoWO4 |
| 4.DB.35 | Qitianlingite | (Fe,Mn)2(Nb,Ta)2WO10 |
| 4.DB.35 | Tantalaeschynite-(Ce) | Ce(TiTa)O6 |
| 4.DB.35 | Tantalite-(Mg) | (Mg,Fe2+)(Ta,Nb)2O6 |
| 4.DB.35 | Columbite-(Mn) | Mn2+Nb2O6 |
| 4.DB.35 | Tantalite-(Mn) | Mn2+Ta2O6 |
| 4.DB.35 | Columbite-(Fe) | Fe2+Nb2O6 |
| 4.DB.35 | Columbite-(Mg) | (Mg,Fe,Mn)(Nb,Ta)2O6 |
| 4.DB.35 | Tantalite-(Fe) | Fe2+Ta2O6 |
| 4.DB.40 | Ferrotitanowodginite | Fe2+TiTa2O8 |
| 4.DB.40 | 'Wolframowodginite' | Mn(Mn,Sn,Fe,Ta)(W,Ta,Nb)2O8 |
| 4.DB.40 | Lithiotantite | LiTa3O8 |
| 4.DB.40 | Lithiowodginite | LiTa3O8 |
| 4.DB.40 | Titanowodginite | Mn2+TiTa2O8 |
| 4.DB.40 | Tantalowodginite | (Mn2+0.5◻0.5)TaTa2O8 |
| 4.DB.40 | Wodginite | Mn2+Sn4+Ta2O8 |
| 4.DB.40 | Ferrowodginite | Fe2+Sn4+Ta2O8 |
| 4.DB.45 | Tivanite | V3+TiO3(OH) |
| 4.DB.50 | Carmichaelite | (Ti,Cr,Fe)[O2-x(OH)x] |
| 4.DB.55 | Alumotantite | AlTaO4 |
| 4.DB.60 | Biehlite | ((Sb,As)O)2[MoO4] |
Fluorescence of Tapiolite-(Fe)
Not fluorescent
Other Information
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 Tapiolite-(Fe)
mindat.org URL:
https://www.mindat.org/min-1531.html
Please feel free to link to this page.
Please feel free to link to this page.
Search Engines:
Copper Mountain pegmatite District, Bridger Mts, Fremont County, Wyoming, USA