Tantalaeschynite-(Y) Mineral Data + Say TANTALAESCHYNITE-(Y)

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: São José do Sabugí, Paraíba, 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.
 

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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 - DipyramidalH-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 Diaphaniety: Diaphaniety: 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:

relectron=6.61 gm/cc
note: rTantalaeschynite-(Y) =7.68 gm/cc.
Help on Fermion Index Fermion Index Fermion Index = 0.00388
Boson Index = 0.99612
Help on Photoelectric: Photoelectric:

PETantalaeschynite-(Y) = 716.11 barns/electron
U=PETantalaeschynite-(Y) x relectron=4,734.33 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 7,723.25 (Gamma Ray American Petroleum Institute Units)

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 7,723.25 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: 8.3.6.4 (8)Multiple Oxides with Nb, Ta, and Ti
  (8.3)where A (B2O6)
  (8.3.6)Dana Group
 
8.3.6.1 Aeschynite-(Ce) (Ce,Ca,Fe)(Ti,Nb)2(O,OH)6 Pmnb 2/m 2/m 2/m
 
8.3.6.2 Niobo-aeschynite-(Ce) (Ce,Ca)(Nb,Ti)2(O,OH)6 Pbnm 2/m 2/m 2/m
 
8.3.6.3 Aeschynite-(Y) (Y,Ca,Fe)(Ti,Nb)2(O,OH)6 Pbnm 2/m 2/m 2/m
 
8.3.6.4 Tantalaeschynite-(Y) (Y,Ce,Ca)(Ta,Ti,Nb)2O6 Pbnm 2/m 2/m 2/m
 
8.3.6.5 Aeschynite-(Nd) (Nd,Ce)(Ti,Nb)2(O,OH)6 Pmnb ? 2/m 2/m 2/m
 
8.3.6.6 Niobo-aeschynite-(Nd)! (Nd,Ce)(Nb,Ti)2(O,OH)6 Pbnm 2/m 2/m 2/m
Help on Strunz Class: Strunz Class: IV/D.21-80 IV - Oxides
  IV/D - Oxides with metal : oxygen = 1:2 (MO2 and related compounds)
  IV/D.21 - Aeschynite series
 
IV/D.21-10 Aeschynite-(Y) (Y,Ca,Fe)(Ti,Nb)2(O,OH)6 Pbnm 2/m 2/m 2/m
 
IV/D.21-20 Aeschynite-(Ce) (Ce,Ca,Fe)(Ti,Nb)2(O,OH)6 Pmnb 2/m 2/m 2/m
 
IV/D.21-30 Aeschynite-(Nd) (Nd,Ce)(Ti,Nb)2(O,OH)6 Pmnb ? 2/m 2/m 2/m
 
IV/D.21-40 Vigezzite (Ca,Ce)(Nb,Ta,Ti)2O6 Pmnb 2/m 2/m 2/m
 
IV/D.21-50 Niobo-aeschynite-(Ce) (Ce,Ca)(Nb,Ti)2(O,OH)6 Pbnm 2/m 2/m 2/m
 
IV/D.21-60 Niobo-aeschynite-(Nd)! (Nd,Ce)(Nb,Ti)2(O,OH)6 Pbnm 2/m 2/m 2/m
 
IV/D.21-70 Rynersonite Ca(Ta,Nb)2O6 Pmnb 2/m 2/m 2/m
 
IV/D.21-80 Tantalaeschynite-(Y) (Y,Ce,Ca)(Ta,Ti,Nb)2O6 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 -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

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Tantalaeschynite-(Y)

(Y,Ce,Ca)(Ta,Ti,Nb)2O6
Dana No: 8.3.6.4 Strunz No: IV/D.21-80
Locality:

 

Notes:

 
 
   
 
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