Manganocolumbite Mineral Data

Manganocolumbite Mineral Data

General Manganocolumbite Information

Chemical Formula:

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

Composition:

Molecular Weight = 394.81 gm

Tantalum 27.50 % Ta 33.58 % Ta₂O₅

Titanium 1.21 % Ti 2.02 % TiO₂

Manganese 6.96 % Mn 8.98 % MnO

Niobium 32.94 % Nb 47.13 % Nb₂O₅

Iron 7.07 % Fe 9.10 % FeO

Oxygen 24.31 % O

______ ______

100.00 % 100.81 % = TOTAL OXIDE

Empirical Formula:

Mn²⁺_0.5Fe²⁺_0.5Nb_1.4Ta_0.6Ti_0.1O₆

Environment:

Constituent of granitic pegmatites.

IMA Status:

Valid Species (Pre-IMA) 1892

Locality:

Globe and Harding pegmatites, Taos County, New Mexico, USA. Link to MinDat.org Location Data.

Name Origin:

Named for the MANGANese content and the relationship to columbite (ferrocolumbite).

Synonym:

ICSD 31944

PDF 33-899

Manganocolumbite Image

Images:

Manganocolumbite

Comments: Small brown tabular crystals of manganocolumbite in a pegmatite.
Location: Neuland Quarry, D?bsch?tz, K?nigshain, Oberlausitz, Saxony, Germany. Scale: Picture size 4 mm.
© Thomas Witzke / Abraxas-Verlag

Manganocolumbite Crystallography

Axial Ratios:

a:b:c =0.3995:1:0.3522

Cell Dimensions:

a = 5.767, b = 14.434, c = 5.085, Z = 4; V = 423.28 Den(Calc)= 6.20

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): 2.991(1), 3.695(0.35), 1.7358(0.14),

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

Tarantino S C , Zema M , American Mineralogist , 90 (2005) p.1291-1300, Mixing and ordering behavior in manganocolumbite-ferrocolumbite solid solution:, A single-crystal X-ray diffraction study, Sample: RIO n5 Qm=1 from Rio Arriba Co., Globe Mine, U.S.A.

View Additional jPOWD Structure files for Manganocolumbite
[1] [10] [11] [12] [2] [3] [4] [5] [6] [7] [8] [9]

Physical Properties of Manganocolumbite

Cleavage:

[010] Distinct, [100] Indistinct

Color:

Brownish black, Black.

Density:

5.28

Diaphaniety:

Opaque

Fracture:

Brittle - Subconchoidal - Brittle frature with subconchoidal fragments

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

6 - Orthoclase

Luster:

Sub Metallic

Streak:

reddish black

Optical Properties of Manganocolumbite

Optical Data:

Biaxial (-)

NCalc= 2.36 - from Gladstone-Dale relationship (KC = 0.2198) where Ncalc=Dcalc*KC+1
NCalc= 2.16 - from Gladstone-Dale relationship (KC = 0.2198) where Ncalc=Dmeas*KC+1

Pleochroism (x):

strong red.

Pleochroism (y):

red brown.

Pleochroism (z):

orange.

RL Color:

Grayish white with a brownish tint and reddish brown internal reflections.

Calculated Properties of Manganocolumbite

Electron Density:

r_electron=5.56 gm/cc
note: r_{Manganocolumbite}=6.20 gm/cc.

Fermion Index

Fermion Index = 0.00321
Boson Index = 0.99679

Photoelectric:

PE_{Manganocolumbite}= 372.39 barns/electron
U=PE_{Manganocolumbite} x r_electron=2,068.95 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Manganocolumbite is Not Radioactive

Manganocolumbite Classification

Dana Class:

8.3.2.4 (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.18-20 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 Manganocolumbite Information

References:

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

Search for Manganocolumbite using:

[ALTAVISTA] [AOL] [About.com] [All-The-Web] [HotBot] [Ixquick] [LookSmart] [MAMMA] [MSN.COM] [Netscape] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Manganocolumbite :
AA Mineral Specimens
A-Rocks Auction
Adams Minerals
B and L Minerals
Dakota Matrix
Dan Weinrich Fine Minerals
Dan Weinrich Auctions
e-Rocks Auctions
Excalibur Minerals
Exceptional Minerals
Fabre Minerals
Greenside Minerals
John Betts Fine Minerals
Masons Minerals
Mineral News
Mineral of the Month Club
MineralsWeb Fine Minerals
Minernet.it
Rockshop.cz Kalat Fine Minerals
T G Fine Minerals
Wrights Rock Shop

Translate Manganocolumbite Mineral Data :

Ask about Manganocolumbite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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

Manganocolumbite

(Mn,Fe++)(Nb,Ta)2O6
Dana No: 8.3.2.4 Strunz No: IV/D.18-20
Locality:

Notes: