Tundrite-(Ce) Mineral Data

General Tundrite-(Ce) Information

Chemical Formula:

Na2Ce2TiO2(SiO4)(CO3)2

Composition:

Molecular Weight = 614.89 gm

Sodium 7.13 % Na 9.61 % Na₂O

Calcium 0.25 % Ca 0.36 % CaO

Lanthanum 14.03 % La 16.45 % La₂O₃

Cerium 23.47 % Ce 27.49 % Ce₂O₃

Praeseodymium 1.86 % Pr 2.17 % Pr₂O₃

Samarium 0.34 % Sm 0.40 % Sm₂O₃

Titanium 6.81 % Ti 11.37 % TiO₂

Niobium 1.65 % Nb 2.36 % Nb₂O₅

Silicon 4.44 % Si 9.49 % SiO₂

Hydrogen 0.04 % H 0.37 % H₂O

Carbon 3.86 % C 14.16 % CO₂

Neodymium 5.37 % Nd 6.27 % Nd₂O₃

Oxygen 30.75 % O

______ ______

100.00 % 100.47 % = TOTAL OXIDE

Empirical Formula:

Na_1.9Ca_0.03Ce_1.03La_0.62Nd_0.22Pr_0.08Sm_0.01Ti_0.87Nb_0.1O₂H_0.25(SiO₄)_0.972(CO₃)_0.98

Environment:

Occurs in nepheline syenite pegmatites.

IMA Status:

Approved IMA 1963

Locality:

Mt. Nepkha, Lovozero tundra, Kola Peninsula, Russa and Mont Saint-Hilaire quarry, Quebec, Canada. Link to MinDat.org Location Data.

Name Origin:

Named after the Russian locality.

Name Pronunciation:

Tundrite-(Ce)

Synonym:

ICSD 20932

PDF 25-1188

Tundrite-(Ce) Image

Images:

Tundrite-(Ce)

Comments: Radiating group of tundrite-(Ce) crystals in matrix. (CanMin, v46:415).
Location: Mont Saint-Hilaire, Quebec. Scale: Crystal size 25 mm.
© Willow Wight/Canadian Mineralogist

Images:

Tundrite-(Ce)

Comments: Prismatic, yellowish, terminated tundrite-(Ce) crystal (CanMin, v46:415).
Location: Mont Saint-Hilaire, Quebec. Scale: Crystal size 7 mm.
© Quintin Wight/Canadian Mineralogist

Images:

Tundrite-(Ce)

Comments: Brown elongated bladed tundrite-(Ce) crystals associated with white orthoclase and black amphibole.
Location: Barkeviksjaer, Norway. Scale: See Image.
© Rruff Database

Tundrite-(Ce) Crystallography

Axial Ratios:

a:b:c =0.5427:1:0.3601

Cell Dimensions:

a = 7.5702, b = 13.949, c = 5.0235, Z = 2; alpha = 100.19°, beta = 70.88°, gamma = 101.26° V = 483.80 Den(Calc)= 4.22

Crystal System:

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

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.72(1), 2.78(1), 3.06(0.8),

Physical Properties of Tundrite-(Ce)

Cleavage:

{010} Perfect

Color:

Brownish yellow, Greenish yellow.

Density:

4.08

Diaphaneity:

Translucent

Fracture:

Brittle - Splintery - Brittle fracture leaving splintery fragments.

Habit:

Acicular - Occurs as needle-like crystals.

Habit:

Striated - Parallel lines on crystal surface or cleavage face.

Hardness:

3 - Calcite

Luminescence:

Non-fluorescent.

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Tundrite-(Ce)

Gladstone-Dale:

CI meas= -0.005 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.021 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1928,KPDmeas= 0.198,KC= 0.1969
Ncalc = 1.8 - 1.83

Optical Data:

Biaxial (+), a=1.743, b=1.8, g=1.88, bire=0.1370

Pleochroism (y):

pale yellow.

Pleochroism (z):

greenish yellow.

Calculated Properties of Tundrite-(Ce)

Electron Density:

Bulk Density (Electron Density)=3.72 gm/cc
note: Specific Gravity of Tundrite-(Ce) =4.08 gm/cc.

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Photoelectric:

PE_{Tundrite-(Ce)}= 232.37 barns/electron
U=PE_{Tundrite-(Ce)} x r_electron= 864.18 barns/cc.

Radioactivity:

GRapi = 43,839.44 (Gamma Ray American Petroleum Institute Units)
Concentration of Tundrite-(Ce) per GRapi unit = 22.81 (PPM)

Tundrite-(Ce) 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) 693.82 ±173.45 grams of pure Tundrite-(Ce) .

**Estimated Radioactivity from Tundrite-(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 / 7.76 cm	1,009,988	2.73E-05	43,839.44	14.41
100 gm / 3.60 cm	100,999	2.73E-06	4,383.94	1.44
10 gm / 1.67 cm	10,100	2.73E-07	438.39	0.14
1 gm / 7.76 mm	1,010	2.73E-08	43.84	0.01
0.1 gm / 3.60 mm	101	2.73E-09	4.38	0.00
0.01 gm / 1.67 mm	10	2.73E-10	0.44	0.00
0.001 gm / 0.78 mm	1	2.73E-11	0.04	0.00

Weight of pure Tundrite-(Ce) in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.08 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 ( 2.25 % Th) From Sum REE Elements (45.07 % REE)

Tundrite-(Ce) Classification

Dana Class:

17.01.11.01 (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-(Ce) Information

References:

NAME( Dana8) PHYS. PROP.(Dana8; AmMin v93:1946) OPTIC PROP.(AmMin v93:1946)

See Also:

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

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Tundrite-(Ce)

Na2Ce2TiO2(SiO4)(CO3)2
Dana No: 17.01.11.01 Strunz No: 09.AH.10
Locality:

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