Calciotantite Mineral Data

Calciotantite Mineral Data +

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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).

Synonym:

ICSD 1854

PDF 15-679

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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:

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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

Diaphaniety:

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:

r_electron=5.69 gm/cc
note: r_{Calciotantite}=6.53 gm/cc.

Fermion Index

Fermion Index = 0.00023
Boson Index = 0.99977

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Calciotantite is Not Radioactive

Calciotantite Classification

Dana Class:

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

(8.6)Dana Type

(8.6.2)Dana Group

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

8.6.2.2 Natrotantite Na2Ta4O11 R 3-c 3 2/m

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

Strunz Class:

IV/D.26-40 IV - Oxides

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

IV/D.26 - Lithiotantite - Cesplumtantite series

IV/D.26-10 Lithiotantite Li(Ta,Nb)3O8 P 2₁/c 2/m

IV/D.26-20 Natrotantite Na2Ta4O11 R 3-c 3 2/m

IV/D.26-30 Irtyshite Na2(Ta,Nb)4O11 P 6₃/m 6/m

IV/D.26-40 Calciotantite Ca(Ta,Nb)4O11 P 6₃22 6 2 2

IV/D.26-50 Ungursaite? NaCa5(Ta,Nb)24O65(OH) P 6₃/m,P 6₃ Hex

IV/D.26-60 Cesplumtantite (Cs,Na,Ca)2(Pb,Sb,Sn)3Ta8O24 Unk Tetra

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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

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Calciotantite

Ca(Ta,Nb)4O11
Dana No: 8.6.2.1 Strunz No: IV/D.26-40
Locality:

Notes: