Tundrite-(Nd) Mineral Data

General Tundrite-(Nd) Information

Chemical Formula:

Na3(Nd,La)4(Ti,Nb)2(SiO4)2(CO3)3O4(OH)•2(H2O)

Composition:

Molecular Weight = 1,240.10 gm

Sodium 5.56 % Na 7.50 % Na₂O

Lanthanum 11.20 % La 13.14 % La₂O₃

Titanium 5.79 % Ti 9.66 % TiO₂

Niobium 3.75 % Nb 5.36 % Nb₂O₅

Silicon 4.53 % Si 9.69 % SiO₂

Hydrogen 0.41 % H 3.63 % H₂O

Carbon 2.91 % C 10.65 % CO₂

Neodymium 34.89 % Nd 40.70 % Nd₂O₃

Oxygen 30.96 % O

______ ______

100.00 % 100.32 % = TOTAL OXIDE

Empirical Formula:

Na₃Nd₃LaTi_1.5Nb_0.5(SiO₄)₂(CO₃)₃O₄(OH)�2(H₂O)

Environment:

Pegmatite veins associated with layered nepheline syenite.

IMA Status:

Approved IMA 1968

Locality:

Ilimaussaq intrusion, at Kringlerne, Kangerdluarssuk Plateau, southern Greenland. Link to MinDat.org Location Data.

Name Origin:

Named for its relation to tundrite-(Ce), and its neodymium content.

Name Pronunciation:

Tundrite-(Nd)

Tundrite-(Nd) Crystallography

Axial Ratios:

a:b:c =0.5426:1:0.3641

Cell Dimensions:

a = 7.51, b = 13.84, c = 5.04, Z = 1; alpha = 98°, beta = 70.667°, gamma = 99° V = 483.47 Den(Calc)= 4.26

Crystal System:

Triclinic - Pedial H-M Symbol (1) Space Group: P1

Physical Properties of Tundrite-(Nd)

Cleavage:

{???} Good

Color:

Yellow, Greenish yellow.

Density:

3.7

Hardness:

3 - Calcite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Tundrite-(Nd)

Optical Data:

NCalc= 1.83 - from Gladstone-Dale relationship (KC = 0.1967) where Ncalc=Dcalc*KC+1
NCalc= 1.73 - from Gladstone-Dale relationship (KC = 0.1967) where Ncalc=Dmeas*KC+1

Calculated Properties of Tundrite-(Nd)

Electron Density:

Bulk Density (Electron Density)=3.87 gm/cc
note: Specific Gravity of Tundrite-(Nd) =4.24 gm/cc.

Fermion Index:

Fermion Index = 0.08
Boson Index = 0.92

Photoelectric:

PE_{Tundrite-(Nd)}= 260.03 barns/electron
U=PE_{Tundrite-(Nd)} x r_electron=1,007.30 barns/cc.

Radioactivity:

GRapi = 44,921.97 (Gamma Ray American Petroleum Institute Units)
Concentration of Tundrite-(Nd) per GRapi unit = 22.26 (PPM)

Tundrite-(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) 677.10 ±169.27 grams of pure Tundrite-(Nd) .

**Estimated Radioactivity from Tundrite-(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 / 7.67 cm	1,032,533	2.79E-05	44,921.97	14.77
100 gm / 3.56 cm	103,253	2.79E-06	4,492.20	1.48
10 gm / 1.65 cm	10,325	2.79E-07	449.22	0.15
1 gm / 7.67 mm	1,033	2.79E-08	44.92	0.01
0.1 gm / 3.56 mm	103	2.79E-09	4.49	0.00
0.01 gm / 1.65 mm	10	2.79E-10	0.45	0.00
0.001 gm / 0.77 mm	1	2.79E-11	0.04	0.00

Weight of pure Tundrite-(Nd) in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.24 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 ( 2.30 % Th) From Sum REE Elements (46.10 % REE)

Tundrite-(Nd) Classification

Dana Class:

17.01.11.02 (17)Compound Carbonates

(17.01)with miscellaneous formulae

(17.01.11)Tundrite Group

17.01.11.01 Tundrite-(Ce) Na2Ce2TiO2(SiO4)(CO3)2 P1 1

17.01.11.02 Tundrite-(Nd) Na3(Nd,La)4(Ti,Nb)2(SiO4)2(CO3)3O4(OH)•2(H2O) P1 1

Strunz Class:

09.AH.10 09 - SILICATES (Germanates)

09.A - Nesosilicates

09.AH -Nesosilicates with CO3, SO4, PO4, etc.

09.AH.10 Tundrite-(Ce) Na2Ce2TiO2(SiO4)(CO3)2 P1 1

09.AH.10 Tundrite-(Nd) Na3(Nd,La)4(Ti,Nb)2(SiO4)2(CO3)3O4(OH)•2(H2O) P1 1

Other Tundrite-(Nd) Information

References:

NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Tundrite-(Nd) :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - GeoScienceWorld
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info

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Tundrite-(Nd)

Na3(Nd,La)4(Ti,Nb)2(SiO4)2(CO3)3O4(OH)•2(H2O)
Dana No: 17.01.11.02 Strunz No: 09.AH.10
Locality:

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