Tapiolite-(Mn) Mineral Data

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General Tapiolite-(Mn) Information

Chemical Formula:

(Mn++,Fe++)(Ta,Nb)2O6

Composition:

Molecular Weight = 482.71 gm

Calcium 0.33 % Ca 0.46 % CaO

Tantalum 63.73 % Ta 77.81 % Ta₂O₅

Manganese 7.97 % Mn 10.29 % MnO

Niobium 5.77 % Nb 8.26 % Nb₂O₅

Iron 2.31 % Fe 2.98 % FeO

Oxygen 19.89 % O

______ ______

100.00 % 99.80 % = TOTAL OXIDE

Empirical Formula:

Mn²⁺_0.7O₆Fe²⁺_0.2Ca_0.04Ta_1.7Nb_0.3

Environment:

Accessory mineral in a lithium-rich pegmatite dike.

IMA Status:

Approved IMA 1983

Locality:

Viitaniemi pegmatite, Erajarvi area, Orivesi, Finland. Link to MinDat.org Location Data.

Name Origin:

Named for the MANGANese content and relationship to ferroTAPIOLITE.

Name Pronunciation:

Tapiolite-(Mn) + Pronunciation

Synonym:

Manganotapiolite - Renamed to Tapiolite-(Mn) by Mineralogical Record, v39 (2008), p 131

Tapiolite-(Mn) Image

Images:

Click Here for Larger Tapiolite-(Mn) Image

Tapiolite-(Mn) Tapiolite

Comments: Black opaque resinous massive manganotapiolite.
Location: Skogbole Mine, Kimito, Turku ja Pori, Finland. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Tapiolite-(Mn) Crystallography

Axial Ratios:

a:c = 1:1.94708

Cell Dimensions:

a = 4.762, c = 9.272, Z = 2; V = 210.26 Den(Calc)= 7.62

Crystal System:

Tetragonal - Ditetragonal DipyramidalH-M Symbol (4/m 2/m 2/m) Space Group: P 4₁/mnm

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.367(1), 1.754(0.9), 2.592(0.9),

Physical Properties of Tapiolite-(Mn)

Cleavage:

None

Color:

Dark brown, Black brown.

Density:

7.72

Diaphaneity:

Translucent to Opaque

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Hardness:

6 - Orthoclase

Luster:

Sub Metallic

Streak:

dark brown

Optical Properties of Tapiolite-(Mn)

Dichroism (e):

yellowish brown.

Dichroism (w):

reddish brown.

Optical Data:

Uniaxial (?).

NCalc= 2.27 - from Gladstone-Dale relationship (KC = 0.1665) where Ncalc=Dcalc*KC+1
NCalc= 2.29 - from Gladstone-Dale relationship (KC = 0.1665) where Ncalc=Dmeas*KC+1

RL Bireflectance:

Weak, light brownish gray to gray.

RL Color:

Gray with strong red-brown internal reflections.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Tapiolite-(Mn) in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
470 nm	16.00	15.70
546 nm	14.70	14.10
589 nm	15.00	14.80
650 nm	15.10	14.60

**Calculated Relative Intensity Colors of Tapiolite-(Mn) in Air**
Relative Intensity	0%	70%	100%	140%	210%	280%	350%	420%	490%	560%	610%
R₁
R₂

Calculated Properties of Tapiolite-(Mn)

Electron Density:

Bulk Density (Electron Density)=6.56 gm/cc
note: Specific Gravity of Tapiolite-(Mn) =7.62 gm/cc.

Fermion Index:

Fermion Index = 0.0006669592
Boson Index = 0.9993330408

Photoelectric:

PE_{Tapiolite-(Mn)}= 774.42 barns/electron
U=PE_{Tapiolite-(Mn)} x rElectron Density=5,083.12 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Tapiolite-(Mn) is Not Radioactive

Tapiolite-(Mn) Classification

Dana Class:

08.03.01.02 (08)Multiple Oxides with Nb, Ta, and Ti

(08.03)where A (B2O6)

(08.03.01)Tapiolite Series

08.03.01.00 Tapiolite* (Fe,Mn)(Ta,Nb)2O6 P 4₁/mnm 4/m 2/m 2/m

08.03.01.01 Tapiolite-(Fe) (Fe,Mn)(Ta,Nb)2O6 P 4₁/mnm 4/m 2/m 2/m

08.03.01.02 Tapiolite-(Mn) (Mn,Fe)(Ta,Nb)2O6 P 4₁/mnm 4/m 2/m 2/m

Strunz Class:

04.DB.10 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate

04.D - Metal:Oxygen = 1:2 and similar

04.DB -With medium-sized cations; chains of edge-sharing octahedra

04.DB.10 Bystromite MgSb2O6 P 4₁/mnm 4/m 2/m 2/m

04.DB.10 Tapiolite-(Fe) (Fe,Mn)(Ta,Nb)2O6 P 4₁/mnm 4/m 2/m 2/m

04.DB.10 Ordonezite ZnSb2O6 P 4₁/mnm 4/m 2/m 2/m

04.DB.10 Tapiolite-(Mn) (Mn,Fe)(Ta,Nb)2O6 P 4₁/mnm 4/m 2/m 2/m

04.DB.10 Tapiolite* (Fe,Mn)(Ta,Nb)2O6 P 4₁/mnm 4/m 2/m 2/m

Other Tapiolite-(Mn) Information

References:

NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic3)

See Also:

Links to other databases for Tapiolite-(Mn) :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Print or Cut-and-Paste your Tapiolite-(Mn) Specimen Label here :

Tapiolite-(Mn)

(Mn++,Fe++)(Ta,Nb)2O6
Dana No: 08.03.01.02 Strunz No: 04.DB.10
Locality:

Notes: