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Tantalaeschynite-(Y) Mineral Data

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General Tantalaeschynite-(Y) Information

Help on Chemical  Formula: Chemical Formula: (Y,Ce,Ca)(Ta,Ti,Nb)2O6
Help on Composition: Composition: Molecular Weight = 499.75 gm
   Calcium    0.80 %  Ca    1.12 % CaO
   Cerium     8.41 %  Ce    9.85 % Ce2O3
   Yttrium   10.67 %  Y    13.56 % Y2O3
   Tantalum  54.31 %  Ta   66.32 % Ta2O5
   Titanium   2.87 %  Ti    4.80 % TiO2
   Niobium    3.72 %  Nb    5.32 % Nb2O5
   Oxygen    19.21 %  O
            ______        ______ 
            100.00 %      100.96 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Y0.6Ce0.3Ca0.1Ta1.5Ti0.3Nb0.2O6
Help on Environment: Environment: In a pegmatite.
Help on IMA Status: IMA Status: Approved IMA 1974
Help on Locality: Locality: S�o Jose do Sabug�, Para�ba, Brazil. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for its composition and from the Greek for "shame," in allusion to the inability of chemists, at the time of its discovery, to separate some of its constituents.
Help on Name Pronunciation: Name Pronunciation: Tantalaeschynite-(Y) + Pronunciation Say TANTALAESCHYNITE-(Y)
Help on Synonym: Synonym: Tantal-aeschynite-(Y) - Renamed Tantalaeschynite-(Y) by Mineralogical Record, v39 (2008), p131
 

Tantalaeschynite-(Y) Image

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  Tantalaeschynite-(Y)

Comments: Nearly pure fragment of tantalaeschynite-(Y).
Location: Raposa Pegmatite, São José do Sabugi, Paraíba, Northeast Region, Brazil. Scale: Specimen Size 1 cm.
© Jeff Weissman / Photographic Guide to Mineral Species

Tantalaeschynite-(Y) Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.4867:1:0.6727
Help on Cell Dimensions: Cell Dimensions: a = 5.34, b = 10.97, c = 7.38, Z = 4; V = 432.32 Den(Calc)= 7.68
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pbnm
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.94(1), 3(1), 1.581(0.7),
 

Physical Properties of Tantalaeschynite-(Y)

Help on Cleavage: Cleavage: None
Help on Color: Color: Brownish black, Black.
Help on Density: Density: 5.75 - 6.13, Average = 5.94
Help on Diaphaneity: Diaphaneity: Subtranslucent
Help on Fracture: Fracture: Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).
Help on Habit: Habit: Metamict - Mineral originally crystalline, now amorphous due to radiation damage.
Help on Hardness: Hardness: 5.5-6 - Knife Blade-Orthoclase
Help on Luminescence: Luminescence: Radioactive.
Help on Luster: Luster: Resinous
Help on Streak: Streak: yellowish brown
 

Optical Properties of Tantalaeschynite-(Y)

Help on Optical Data: Optical Data: Isotropic.
  NCalc= 2.33 - from Gladstone-Dale relationship (KC = 0.1728) where Ncalc=Dcalc*KC+1
NCalc= 2.03 - from Gladstone-Dale relationship (KC = 0.1728) where Ncalc=Dmeas*KC+1
Help on RL Color: RL Color: Dark gray with abundant white to dark red internal reflections.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Tantalaeschynite-(Y) in Air
λ R  ∑ R(λ) 
 470 nm   14.50   
 546 nm   14.20 
 589 nm   14.00 
 650 nm   14.00 
Calculated Relative Intensity Colors of Tantalaeschynite-(Y) in Air
Relative
Intensity
   0%   70% 100% 140% 210% 280% 350% 420% 490% 560% 630%
R                      
 

Calculated Properties of Tantalaeschynite-(Y)

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=6.61 gm/cc
note: Specific Gravity of Tantalaeschynite-(Y) =7.68 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0038845967
Boson Index = 0.9961154033
Help on Photoelectric: Photoelectric: PETantalaeschynite-(Y) = 716.11 barns/electron
U=PETantalaeschynite-(Y) x relectron=4,734.34 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 7,723.26 (Gamma Ray American Petroleum Institute Units)
Concentration of Tantalaeschynite-(Y) per GRapi unit = 129.48 (PPM)

Tantalaeschynite-(Y) is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.

Estimated Radioactivity from Tantalaeschynite-(Y) - mild
Specimen
Size
Weight/Volume
(Sphere)
*
Calculated
Activity
Bequerols
(Bq)
Calculated
Activity
Curies (Ci)
Estimated
Activity
GR(api)
Estimated
Exposure
(mRem**)/hr
If Held in Hand
For One Hour
1000 gm / 6.29 cm 188,409 5.09E-06 7,723.26 2.54
100 gm / 2.92 cm 18,841 5.09E-07 772.33 0.25
10 gm / 1.35 cm 1,884 5.09E-08 77.23 0.03
1 gm / 6.29 mm 188 5.09E-09 7.72 0.00
0.1 gm / 2.92 mm 19 5.09E-10 0.77 0.00
0.01 gm / 1.35 mm 2 5.09E-11 0.08 0.00
0.001 gm / 0.63 mm 0 5.09E-12 0.01 0.00

Weight of pure Tantalaeschynite-(Y) in grams (gm) and Calculated Diameter of a Sphere with a Density of 7.68 gm/cc.*
Goverment Estimate of Average Annual Exposure ( 360 mRem) **
Note: 10 microsieverts/hr = 1 mRem/hr **
Max Permissable Adult Dose 50,000 mRem/yr (hands), 15,000 mRem/yr (eyes)
Lethal Dose LD(50) Exposure 400,000 to 500,000 mRem
Estimated Thorium Activity ( 0.42 % Th) From Sum REE Elements ( 8.41 % REE)
 

Tantalaeschynite-(Y) Classification

Help on  Dana Class: Dana Class: 08.03.06.04 (08)Multiple Oxides with Nb, Ta, and Ti
  (08.03)where A (B2O6)
  (08.03.06)Aeschynite group
 
08.03.06.01 Aeschynite-(Ce) (Ce,Ca,Fe)(Ti,Nb)2(O,OH)6 Pmnb 2/m 2/m 2/m
 
08.03.06.02 Nioboaeschynite-(Ce) (Ce,Ca)(Nb,Ti)2(O,OH)6 Pbnm 2/m 2/m 2/m
 
08.03.06.03 Aeschynite-(Y) (Y,Ca,Fe)(Ti,Nb)2(O,OH)6 Pbnm 2/m 2/m 2/m
 
08.03.06.04 Tantalaeschynite-(Y) (Y,Ce,Ca)(Ta,Ti,Nb)2O6 Pbnm 2/m 2/m 2/m
 
08.03.06.05 Aeschynite-(Nd) (Nd,Ce)(Ti,Nb)2(O,OH)6 Pmnb ? 2/m 2/m 2/m
 
08.03.06.06 Nioboaeschynite-(Nd)! (Nd,Ce)(Nb,Ti)2(O,OH)6 Pbnm 2/m 2/m 2/m
 
08.03.06.07 Nioboaeschynite-(Y)! [(Y,REE),Ca,Th,Fe](Nb,Ti,Ta)2(O,OH)6 Pbnm 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 04.DF.05 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.D - Metal:Oxygen = 1:2 and similar
  04.DF -With large (� medium-sized) cations; dimers and trimers of edge-sharing octahedra
 
04.DF.05 Aeschynite-(Ce) (Ce,Ca,Fe)(Ti,Nb)2(O,OH)6 Pmnb 2/m 2/m 2/m
 
04.DF.05 Aeschynite-(Nd) (Nd,Ce)(Ti,Nb)2(O,OH)6 Pmnb ? 2/m 2/m 2/m
 
04.DF.05 Aeschynite-(Y) (Y,Ca,Fe)(Ti,Nb)2(O,OH)6 Pbnm 2/m 2/m 2/m
 
04.DF.05 Nioboaeschynite-(Ce) (Ce,Ca)(Nb,Ti)2(O,OH)6 Pbnm 2/m 2/m 2/m
 
04.DF.05 Nioboaeschynite-(Nd)! (Nd,Ce)(Nb,Ti)2(O,OH)6 Pbnm 2/m 2/m 2/m
 
04.DF.05 Rynersonite Ca(Ta,Nb)2O6 Pmnb 2/m 2/m 2/m
 
04.DF.05 Tantalaeschynite-(Y) (Y,Ce,Ca)(Ta,Ti,Nb)2O6 Pbnm 2/m 2/m 2/m
 
04.DF.05 Vigezzite (Ca,Ce)(Nb,Ta,Ti)2O6 Pmnb 2/m 2/m 2/m
 
04.DF.05 Nioboaeschynite-(Y)! [(Y,REE),Ca,Th,Fe](Nb,Ti,Ta)2(O,OH)6 Pbnm 2/m 2/m 2/m
 

Other Tantalaeschynite-(Y) Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic3)
Help on See Also: See Also: Links to other databases for Tantalaeschynite-(Y) :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - GeoScienceWorld
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info

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Print or Cut-and-Paste your Tantalaeschynite-(Y) Specimen Label here :

Tantalaeschynite-(Y)

(Y,Ce,Ca)(Ta,Ti,Nb)2O6
Dana No: 08.03.06.04 Strunz No: 04.DF.05
Locality:

 

Notes:

 

 
   
 


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