Calciotantite Mineral Data

General Calciotantite Information

Chemical Formula:

Ca(Ta,Nb)4O11

Composition:

Molecular Weight = 807.80 gm

Calcium 4.96 % Ca 6.94 % CaO

Tantalum 56.00 % Ta 68.38 % Ta₂O₅

Niobium 17.25 % Nb 24.68 % Nb₂O₅

Oxygen 21.79 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

CaTa_2.5Nb_1.5O₁₁

Environment:

Granite pegmatites.

IMA Status:

Approved IMA 1982

Locality:

Kola Peninsula, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for its composition (Calcium, Tantalum).

Name Pronunciation:

Calciotantite + Pronunciation

Synonym:

ICSD 1854

PDF 15-679

Calciotantite Image

Images:

Click Here for Larger Calciotantite Image

Calciotantite Tantalite-(Mn)

Comments: SEM image showing calciotantite (CT), manganotatntalite (MTT), microlite (MT) and lithiowodginite (LW) association.
Location: Granitic pegmatites, Kalba, Kazakhstan. Scale: Scale bar 100 µm and 10 µm.
© Diederik Visser

Calciotantite Crystallography

Axial Ratios:

a:c = 1:1.96147

Cell Dimensions:

a = 6.23, c = 12.22, Z = 2; V = 410.75 Den(Calc)= 6.53

Crystal System:

Hexagonal - TrapezohedralH-M Symbol (6 2 2) Space Group: P 6₃22

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

By Intensity(I/I_o): 1.508(1), 3.02(1), 1.793(0.7),

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
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S - Stereo Pair on/off
H - Help Screen
I - Data Info
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Help on Above

Cooper M A , Hawthorne F C , Cerny P , The Canadian Mineralogist , 37 (1999) p.1289-1294, Ta-Nb order in the crystal structure of niobium-rich calciotantite

View Additional jPOWD Structure files for Calciotantite
[1]

Physical Properties of Calciotantite

Cleavage:

None

Color:

Colorless.

Density:

7.46

Diaphaneity:

Transparent

Habit:

Hexagonal - Six-sided crystal shape in cross-section or habit.

Habit:

Inclusions - Generally found as inclusions in other minerals.

Habit:

Square - Occurs as square crystals in shape or outline.

Hardness:

6.5 - Pyrite

Luminescence:

Non-fluorescent.

Luster:

Adamantine

Streak:

white

Optical Properties of Calciotantite

Optical Data:

NCalc= 2.2 - from Gladstone-Dale relationship (KC = 0.184) where Ncalc=Dcalc*KC+1
NCalc= 2.37 - from Gladstone-Dale relationship (KC = 0.184) where Ncalc=Dmeas*KC+1

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Calciotantite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
486 nm	16.90	16.30
551 nm	17.00	16.60
589 nm	17.10	16.70
656 nm	18.20	18.00

**Calculated Relative Intensity Colors of Calciotantite in Air**
Relative Intensity	0%	60%	100%	120%	180%	240%	300%	360%	420%	480%	540%
R₁
R₂

Calculated Properties of Calciotantite

Electron Density:

Bulk Density (Electron Density)=5.69 gm/cc
note: Specific Gravity of Calciotantite =6.53 gm/cc.

Fermion Index:

Fermion Index = 0.0002387551
Boson Index = 0.9997612449

Photoelectric:

PE_{Calciotantite}= 690.38 barns/electron
U=PE_{Calciotantite} x rElectron Density=3,928.90 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Calciotantite is Not Radioactive

Calciotantite Classification

Dana Class:

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

(08.06)Dana Type

(08.06.02)Calciotantite Group

08.06.02.01 Calciotantite Ca(Ta,Nb)4O11 P 6₃22 6 2 2

08.06.02.02 Natrotantite Na2Ta4O11 R 3-c 3 2/m

08.06.02.03 Irtyshite Na2(Ta,Nb)4O11 P 6₃/m 6/m

Strunz Class:

04.DJ.05 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate

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

04.DJ -With large (± medium-sized) cations; polyhedral frameworks

04.DJ.05 Calciotantite Ca(Ta,Nb)4O11 P 6₃22 6 2 2

04.DJ.05 Irtyshite Na2(Ta,Nb)4O11 P 6₃/m 6/m

04.DJ.05 Natrotantite Na2Ta4O11 R 3-c 3 2/m

Other Calciotantite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(AntBidBlaNic3)

See Also:

Links to other databases for Calciotantite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Ask about Calciotantite here :
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Print or Cut-and-Paste your Calciotantite Specimen Label here :

Calciotantite

Ca(Ta,Nb)4O11
Dana No: 08.06.02.01 Strunz No: 04.DJ.05
Locality:

Notes: