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Calciotantite Mineral Data
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General Calciotantite Information
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 Chemical Formula: |
Ca(Ta,Nb)4O11 |
| Composition: |
Molecular Weight = 807.80 gm |
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Calcium 4.96 % Ca 6.94 % CaO |
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Tantalum 56.00 % Ta 68.38 % Ta2O5 |
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Niobium 17.25 % Nb 24.68 % Nb2O5 |
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Oxygen 21.79 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
| Empirical Formula: |
CaTa2.5Nb1.5O11 |
| 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 |
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PDF 15-679 |
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Calciotantite Image |
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Images:
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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 |
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Calciotantite Crystallography
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| 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 - Trapezohedral H-M Symbol (6 2 2) Space Group: P 6322 |
| X Ray Diffraction: |
By Intensity(I/Io): 1.508(1), 3.02(1), 1.793(0.7), |
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Physical Properties of Calciotantite
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| 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 |
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Optical Properties of Calciotantite
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| 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 |
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∑ R1(λ) |
∑ R2(λ) |
| 486 nm |
16.90 |
16.30 |
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| 551 nm |
17.00 |
16.60 |
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| 589 nm |
17.10 |
16.70 |
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| 656 nm |
18.20 |
18.00 |
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Calculated Relative Intensity Colors of Calciotantite in Air
Relative
Intensity |
0% |
60% |
100% |
120% |
180% |
240% |
300% |
360% |
420% |
480% |
540% |
| R1 |
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| R2 |
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Calculated Properties of Calciotantite
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| Electron Density: |
Bulk Density (Electron Density)=5.69 gm/cc
note: Specific Gravity of Calciotantite =6.53 gm/cc.
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| Fermion Index: |
Fermion Index = 0.0002387551
Boson Index = 0.9997612449 |
| Photoelectric: |
PECalciotantite = 690.38 barns/electron
U=PECalciotantite x rElectron Density=3,928.90 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Calciotantite is Not Radioactive |
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Calciotantite Classification
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| Dana Class: |
08.06.02.01 (08)Multiple Oxides with Nb, Ta, and Ti |
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(08.06)Dana Type |
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(08.06.02)Calciotantite Group |
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08.06.02.01 Calciotantite Ca(Ta,Nb)4O11 P 6322 6 2 2 |
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08.06.02.02 Natrotantite Na2Ta4O11 R 3-c 3 2/m |
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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 |
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04.D - Metal:Oxygen = 1:2 and similar |
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04.DJ -With large (� medium-sized) cations; polyhedral frameworks |
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04.DJ.05 Calciotantite Ca(Ta,Nb)4O11 P 6322 6 2 2 |
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04.DJ.05 Irtyshite Na2(Ta,Nb)4O11 P 63/m 6/m |
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04.DJ.05 Natrotantite Na2Ta4O11 R 3-c 3 2/m |
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Other Calciotantite Information
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| 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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Calciotantite
Ca(Ta,Nb)4O11
Dana No: 08.06.02.01 Strunz No: 04.DJ.05
Locality:
Notes:
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