Manganotantalite Mineral Data

Manganotantalite Mineral Data +

General Manganotantalite Information

Chemical Formula:

MnTa2O6

Composition:

Molecular Weight = 512.83 gm

Tantalum 70.57 % Ta 86.17 % Ta₂O₅

Manganese 10.71 % Mn 13.83 % MnO

Oxygen 18.72 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mn²⁺Ta₂O₆

Environment:

Pegmatites and alluvial deposits.

IMA Status:

Valid Species (Pre-IMA) 1887

Locality:

Custer and Pennington Cos., South Dakota, USA. Link to MinDat.org Location Data.

Name Origin:

Named after its chemical composition containing manganese and tantalum.

Synonym:

Coltan

ICSD 40032

PDF 33-909

Tantalite

Manganotantalite Image

Images:

Manganotantalite

Comments: Floater crystal of doubly terminated, brilliant, with a little red tint manganotantalite.
Location: Pech, Kunar, Afganistan. Scale: 5.5 x 7 cm.
© Fabre Minerals

Manganotantalite Crystallography

Axial Ratios:

a:b:c =0.399:1:0.3523

Cell Dimensions:

a = 5.772, b = 14.465, c = 5.097, Z = 4; V = 425.56 Den(Calc)= 8.00

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pcan

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

By Intensity(I/I_o): 2.99(1), 3.69(0.9), 2.41(0.7),

Crystal Structure:

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Grice J D , Ferguson R B , Hawthorne F C , The Canadian Mineralogist , 14 (1976) p.540-549, The crystal structures of tantalite, ixiolite and wodginite, from Bernic lake, Manitoba I. Tantalite and ixiolite, Locality: Bernic lake, Manitoba, Canada

View Additional jPOWD Structure files for Manganotantalite
[1]

Physical Properties of Manganotantalite

Cleavage:

[100] Imperfect

Color:

Black, Brown.

Density:

8.1

Diaphaniety:

Opaque

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

Crystalline - Fine - Occurs as well-formed fine sized crystals.

Habit:

Disseminated - Occurs in small, distinct particles dispersed in matrix.

Habit:

Massive - Granular - Common texture observed in granite and other igneous rock.

Hardness:

6-6.5 - Orthoclase-Pyrite

Luminescence:

Non-fluorescent.

Luster:

Sub Metallic

Streak:

brown

Optical Properties of Manganotantalite

Gladstone-Dale:

CI meas= 0.047 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.035 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1519,KPDmeas= 0.15,KC= 0.1574

Optical Data:

Biaxial (+), a=2.14-2.19, b=2.15-2.25, g=2.22-2.34, bire=0.0800-0.1500

Pleochroism (x):

red.

Pleochroism (y):

red brown.

Pleochroism (z):

orange.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Manganotantalite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
400 nm	15.50	16.40
420 nm	15.10	16.00
440 nm	14.80	15.70
460 nm	14.60	15.40
480 nm	14.30	15.20
500 nm	14.10	15.00
520 nm	13.90	14.80
540 nm	13.80	14.70
560 nm	13.60	14.50
580 nm	13.60	14.40
600 nm	13.50	14.40
620 nm	13.50	14.30
640 nm	13.40	14.30
660 nm	13.40	14.30
680 nm	13.30	14.20
700 nm	13.30	14.20

**Calculated Relative Intensity Colors of Manganotantalite in Air**
Relative Intensity	0%	70%	100%	140%	210%	280%	350%	420%	490%	560%	630%	650%
R₁
R₂

Calculated Properties of Manganotantalite

Electron Density:

r_electron=6.83 gm/cc
note: r_{Manganotantalite}=8.00 gm/cc.

Fermion Index

Fermion Index = 0.00017
Boson Index = 0.99983

Photoelectric:

PE_{Manganotantalite}= 853.94 barns/electron
U=PE_{Manganotantalite} x r_electron=5,834.70 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Manganotantalite is Not Radioactive

Manganotantalite Classification

Dana Class:

8.3.2.3 (8)Multiple Oxides with Nb, Ta, and Ti

(8.3)where A (B2O6)

(8.3.2)Dana Group

8.3.2.1 Ferrotantalite FeTa2O6 Pcan 2/m 2/m 2/m

8.3.2.2 Ferrocolumbite FeNb2O6 Pcan 2/m 2/m 2/m

8.3.2.3 Manganotantalite MnTa2O6 Pcan 2/m 2/m 2/m

8.3.2.4 Manganocolumbite (Mn,Fe)(Nb,Ta)2O6 Pcan 2/m 2/m 2/m

8.3.2.5 Magnesiocolumbite (Mg,Fe,Mn)(Nb,Ta)2O6 Pcan 2/m 2/m 2/m

8.3.2.6 Magnesiotantalite! (Mg,Fe)(Ta,Nb)2O6 P bcn 2/m 2/m 2/m

Strunz Class:

IV/D.18-40 IV - Oxides

IV/D - Oxides with metal : oxygen = 1:2 (MO2 and related compounds)

IV/D.18 - Columbite series

IV/D.18-10 Magnesiocolumbite (Mg,Fe,Mn)(Nb,Ta)2O6 Pcan 2/m 2/m 2/m

IV/D.18-20 Manganocolumbite (Mn,Fe)(Nb,Ta)2O6 Pcan 2/m 2/m 2/m

IV/D.18-30 Ferrocolumbite FeNb2O6 Pcan 2/m 2/m 2/m

IV/D.18-35 Magnesiotantalite! (Mg,Fe)(Ta,Nb)2O6 P bcn 2/m 2/m 2/m

IV/D.18-40 Manganotantalite MnTa2O6 Pcan 2/m 2/m 2/m

IV/D.18-50 Ferrotantalite FeTa2O6 Pcan 2/m 2/m 2/m

Other Manganotantalite Information

References:

NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic3)

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Print or Cut-and-Paste your Manganotantalite Specimen Label here :

Manganotantalite

MnTa2O6
Dana No: 8.3.2.3 Strunz No: IV/D.18-40
Locality:

Notes: