Nioboaeschynite-(Y) Mineral Data

General Nioboaeschynite-(Y) Information

Chemical Formula:

[(Y,REE),Ca,Th,Fe](Nb,Ti,Ta)2(O,OH)6

Composition:

Molecular Weight = 368.70 gm

Calcium 3.37 % Ca 4.71 % CaO

La,Ce,Pr,Nd,Sm, 13.28 % RE 15.49 % REE₂O₃

Yttrium 4.58 % Y 5.82 % Y₂O₃

Thorium 11.33 % Th 12.89 % ThO₂

Uranium 0.58 % U 0.66 % UO₂

Tantalum 3.44 % Ta 4.19 % Ta₂O₅

Titanium 11.95 % Ti 19.93 % TiO₂

Manganese 0.09 % Mn 0.12 % MnO

Niobium 23.69 % Nb 33.88 % Nb₂O₅

Iron 1.67 % Fe 2.38 % Fe₂O₃

Oxygen 26.04 % O

______ ______

100.00 % 100.08 % = TOTAL OXIDE

Empirical Formula:

Y_0.19REE_0.34Ca_0.31Th_0.18U_0.009Mn²⁺_0.006Nb_0.94Ti_0.92Ta_0.07Fe³⁺_0.11O₆

Environment:

Found in a series of calcite vein-dikes. Aeschynite group

IMA Status:

Approved IMA 2006 (Dana # Added)

Locality:

Bear Lake Diggings, Bancroft area, Ontario, Canada. Link to MinDat.org Location Data.

Name Origin:

Named for the dominant B-site cation, niobium and for the aeschynite group.

Synonym:

IMA2003-038a

Niobo-aeschynite-(Y) - Renamed Nioboaeschynite-(Y) by Mineralogical Record, v39 (2008), p131

Nioboaeschynite-(Y) Image

Images:

Nioboaeschynite-(Y)

Comments: BSE image of a nioboaeschynite-(Y) grain. (CanMin, v46:395).
Location: Bear Lake Diggings, Bancroft area, Ontario, Canada. Scale: See Image.
© Canadian Mineralogist

Nioboaeschynite-(Y) Crystallography

Axial Ratios:

a:b:c =0.4813:1:0.6787

Cell Dimensions:

a = 5.279, b = 10.966, c = 7.443, Z = 4; V = 430.87 Den(Calc)= 5.68

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/I_o): 3.009(1), 2.931(0.69), 2.97(0.36),3.079(0.2), 1.58(0.16), 1.863(0.14), 2.636(0.12), 2.783(0.12),

Physical Properties of Nioboaeschynite-(Y)

Cleavage:

None

Color:

Deep brownish black, Black.

Density:

5.34

Diaphaneity:

Translucent

Fracture:

Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).

Hardness:

5-6 - Between Apatite and Orthoclase

Luster:

Vitreous (Glassy)

Streak:

grayish brown

Optical Properties of Nioboaeschynite-(Y)

Optical Data:

NCalc= 2.39 - from Gladstone-Dale relationship (KC = 0.2454) where Ncalc=Dcalc*KC+1
NCalc= 2.31 - from Gladstone-Dale relationship (KC = 0.2454) where Ncalc=Dmeas*KC+1

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Nioboaeschynite-(Y) in Air**
λ	R	∑ R(λ)
470 nm	14.60
546 nm	14.10
589 nm	13.80
650 nm	13.70

**Standardized Intensity (100%) Reflection Spectra of Nioboaeschynite-(Y) in Oil**
λ	R	∑ R(λ)
470 nm	3.40
546 nm	3.30
589 nm	3.20
650 nm	3.20

**Calculated Relative Intensity Colors of Nioboaeschynite-(Y) in Air**
Relative Intensity	0%	70%	100%	140%	210%	280%	350%	420%	490%	560%	630%	640%
R

**Calculated Relative Intensity Colors of Nioboaeschynite-(Y) in Oil**
Relative Intensity	0%	100%	200%	300%	400%	500%	600%	700%	800%	900%	1000%
R

Calculated Properties of Nioboaeschynite-(Y)

Electron Density:

Bulk Density (Electron Density)=5.12 gm/cc
note: Specific Gravity of Nioboaeschynite-(Y) =5.68 gm/cc.

Fermion Index:

Fermion Index = 0.04
Boson Index = 0.96

Photoelectric:

PE_{Nioboaeschynite-(Y)}= 447.63 barns/electron
U=PE_{Nioboaeschynite-(Y)} x r_electron=2,293.26 barns/cc.

Radioactivity:

GRapi = 262,689.28 (Gamma Ray American Petroleum Institute Units)
Concentration of Nioboaeschynite-(Y) per GRapi unit = 3.81 (PPM)

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

Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 10 cm box) 115.79 ± 28.95 grams of pure Nioboaeschynite-(Y) .

**Estimated Radioactivity from Nioboaeschynite-(Y)** - strong
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 / 6.95 cm	6,116,078	1.65E-04	262,689.28	86.36
100 gm / 3.23 cm	611,608	1.65E-05	26,268.93	8.64
10 gm / 1.50 cm	61,161	1.65E-06	2,626.89	0.86
1 gm / 6.95 mm	6,116	1.65E-07	262.69	0.09
0.1 gm / 3.23 mm	612	1.65E-08	26.27	0.01
0.01 gm / 1.50 mm	61	1.65E-09	2.63	0.00
0.001 gm / 0.70 mm	6	1.65E-10	0.26	0.00

Weight of pure Nioboaeschynite-(Y) in grams (gm) and Calculated Diameter of a Sphere with a Density of 5.68 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

Nioboaeschynite-(Y) Classification

Dana Class:

08.03.06.07 (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

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 (ï¿½ 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 Nioboaeschynite-(Y) Information

References:

NAME( AmMin, v93:1943) PHYS. PROP.(AmMin, v93:1943) OPTIC PROP.(AmMin, v93:1943)

See Also:

Links to other databases for Nioboaeschynite-(Y) :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Nioboaeschynite-(Y)

[(Y,REE),Ca,Th,Fe](Nb,Ti,Ta)2(O,OH)6
Dana No: 08.03.06.07 Strunz No: 04.DF.05
Locality:

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