Nioboaeschynite-(Nd) Mineral Data

General Nioboaeschynite-(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.

Synonym:

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

Nioboaeschynite-(Nd) Crystallography

Crystal System:

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

Physical Properties of Nioboaeschynite-(Nd)

Color:

Black.

Diaphaneity:

Subtranslucent

Hardness:

5-6 - Between Apatite and Orthoclase

Luster:

Adamantine

Optical Properties of Nioboaeschynite-(Nd)

Optical Data:

Calculated Properties of Nioboaeschynite-(Nd)

Fermion Index:

Fermion Index = 0.04
Boson Index = 0.96

Photoelectric:

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

Radioactivity:

GRapi = 32,889.57 (Gamma Ray American Petroleum Institute Units)
Concentration of Nioboaeschynite-(Nd) per GRapi unit = 30.40 (PPM)

Nioboaeschynite-(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 Nioboaeschynite-(Nd) .

**Estimated Radioactivity from Nioboaeschynite-(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	32,889.57	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 Nioboaeschynite-(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)

Nioboaeschynite-(Nd) Classification

Dana Class:

08.03.06.06 (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-(Nd) Information

References:

NAME( Dana8)

See Also:

Links to other databases for Nioboaeschynite-(Nd) :
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-(Nd)

(Nd,Ce)(Nb,Ti)2(O,OH)6
Dana No: 08.03.06.06 Strunz No: 04.DF.05
Locality:

Notes:

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