Niobo-aeschynite-(Ce) Mineral Data

Niobo-aeschynite-(Ce) Mineral Data

General Niobo-aeschynite-(Ce) Information

Chemical Formula:

(Ce,Ca)(Nb,Ti)2(O,OH)6

Composition:

Molecular Weight = 367.65 gm

Calcium 3.27 % Ca 4.58 % CaO

Cerium 22.87 % Ce 26.78 % Ce₂O₃

Titanium 3.26 % Ti 5.43 % TiO₂

Niobium 44.22 % Nb 63.26 % Nb₂O₅

Hydrogen 0.27 % H 2.45 % H₂O

Oxygen 26.11 % O

______ ______

100.00 % 102.50 % = TOTAL OXIDE

Empirical Formula:

Ce_0.6Ca_0.3Ti_0.25Nb_1.75O₅(OH)

IMA Status:

Approved IMA 1960

Locality:

Link to MinDat.org Location Data.

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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Niobo-aeschynite-(Ce) Crystallography

Axial Ratios:

a:b:c =0.4867:1:0.6842

Cell Dimensions:

a = 5.396, b = 11.085, c = 7.585, Z = 4; V = 453.69 Den(Calc)= 5.38

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/I_o): 2.96(1), 3.03(1), 1.55(0.6),

Physical Properties of Niobo-aeschynite-(Ce)

Color:

Black.

Density:

5.04

Diaphaniety:

Subtranslucent

Hardness:

5.3-5.6

Luster:

Resinous

Optical Properties of Niobo-aeschynite-(Ce)

Gladstone-Dale:

CI meas= -0.011 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.053 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2342,KPDmeas= 0.25,KC= 0.2474

Optical Data:

Isotropic, n=2.26.

Calculated Properties of Niobo-aeschynite-(Ce)

Electron Density:

r_electron=4.58 gm/cc
note: r_{Niobo-aeschynite-(Ce)}=5.04 gm/cc.

Fermion Index

Fermion Index = 0.00437
Boson Index = 0.99563

Photoelectric:

PE_{Niobo-aeschynite-(Ce)}= 185.97 barns/electron
U=PE_{Niobo-aeschynite-(Ce)} x r_electron= 851.74 barns/cc.

Radioactivity:

GRapi = 22,164.84 (Gamma Ray American Petroleum Institute Units)

Niobo-aeschynite-(Ce) is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.

**Estimated Radioactivity from Niobo-aeschynite-(Ce)** - weak
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 / 7.24 cm	512,207	1.38E-05	22,164.84	7.29
100 gm / 3.36 cm	51,221	1.38E-06	2,216.48	0.73
10 gm / 1.56 cm	5,122	1.38E-07	221.65	0.07
1 gm / 7.24 mm	512	1.38E-08	22.16	0.01
0.1 gm / 3.36 mm	51	1.38E-09	2.22	0.00
0.01 gm / 1.56 mm	5	1.38E-10	0.22	0.00
0.001 gm / 0.72 mm	1	1.38E-11	0.02	0.00

Weight of pure Niobo-aeschynite-(Ce) in grams (gm) and Calculated Diameter of a Sphere with a Density of 5.04 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 ( 1.14 % Th) From Sum REE Elements (22.87 % REE)

Niobo-aeschynite-(Ce) Classification

Dana Class:

8.3.6.2 (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

Strunz Class:

IV/D.21-50 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 Niobo-aeschynite-(Ce) Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Niobo-aeschynite-(Ce) :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas

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Niobo-aeschynite-(Ce)

(Ce,Ca)(Nb,Ti)2(O,OH)6
Dana No: 8.3.6.2 Strunz No: IV/D.21-50
Locality:

Notes: