Niobo-aeschynite-(Nd) Mineral Data

Niobo-aeschynite-(Nd) Mineral Data

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General Niobo-aeschynite-(Nd) Information

Chemical Formula:

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

Composition:

Molecular Weight = 414.15 gm

Cerium 13.53 % Ce 15.85 % Ce₂O₃

Titanium 2.89 % Ti 4.82 % TiO₂

Niobium 39.26 % Nb 56.16 % Nb₂O₅

Hydrogen 0.24 % H 2.17 % H₂O

Neodymium 20.90 % Nd 24.37 % Nd₂O₃

Oxygen 23.18 % O

______ ______

100.00 % 103.38 % = TOTAL OXIDE

Empirical Formula:

Nd_0.6Ce_0.4Nb_1.75Ti_0.25O₅(OH)

IMA Status:

Approved IMA 1997 (Dana # Added)

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-(Nd) Crystallography

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pbnm

Physical Properties of Niobo-aeschynite-(Nd)

Color:

Black.

Diaphaniety:

Subtranslucent

Hardness:

5-6 - Between Apatite and Orthoclase

Luster:

Adamantine

Calculated Properties of Niobo-aeschynite-(Nd)

Fermion Index

Fermion Index = 0.04664
Boson Index = 0.95336

Photoelectric:

PE_{Niobo-aeschynite-(Nd)}= 254.53 barns/electron
U=PE_{Niobo-aeschynite-(Nd)} x r_electron= . barns/cc.

Radioactivity:

GRapi = 32,889.56 (Gamma Ray American Petroleum Institute Units)

Niobo-aeschynite-(Nd) 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) 924.81 ±231.20 grams of pure Niobo-aeschynite-(Nd) .

**Estimated Radioactivity from Niobo-aeschynite-(Nd)** - 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	771,221	2.08E-05	32,889.56	10.81
100 gm	77,122	2.08E-06	3,288.96	1.08
10 gm	7,712	2.08E-07	328.90	0.11
1 gm	771	2.08E-08	32.89	0.01
0.1 gm	77	2.08E-09	3.29	0.00
0.01 gm	8	2.08E-10	0.33	0.00
0.001 gm	1	2.08E-11	0.03	0.00

Weight of pure Niobo-aeschynite-(Nd) in grams (gm).*
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 ( 1.72 % Th) From Sum REE Elements (34.43 % REE)

Niobo-aeschynite-(Nd) Classification

Dana Class:

8.3.6.6 (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.21-60 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-(Nd) Information

References:

NAME( Dana8)

See Also:

Links to other databases for Niobo-aeschynite-(Nd) :
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-(Nd)

(Nd,Ce)(Nb,Ti)2(O,OH)6
Dana No: 8.3.6.6 Strunz No: IV/D.21-60
Locality:

Notes: