Tundrite-(Ce) Mineral Data

Tundrite-(Ce) Mineral Data +

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General Tundrite-(Ce) Information

Chemical Formula:

Na3(Ce,La)4(Ti,Nb)2(SiO4)2(CO3)3O4(OH)·2(H2O)

Composition:

Molecular Weight = 1,227.72 gm

Sodium 5.62 % Na 7.57 % Na₂O

Lanthanum 11.31 % La 13.27 % La₂O₃

Cerium 34.24 % Ce 40.10 % Ce₂O₃

Titanium 5.85 % Ti 9.76 % TiO₂

Niobium 3.78 % Nb 5.41 % Nb₂O₅

Silicon 4.58 % Si 9.79 % SiO₂

Hydrogen 0.41 % H 3.67 % H₂O

Carbon 2.93 % C 10.75 % CO₂

Oxygen 31.28 % O

______ ______

100.00 % 100.33 % = TOTAL OXIDE

Empirical Formula:

Na₃Ce₃LaTi_1.5Nb_0.5(SiO₄)₂(CO₃)₃O₄(OH)·2(H₂O)

IMA Status:

Approved IMA 1963

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 20932

PDF 25-1188

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Tundrite-(Ce) 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)= 4.22

Crystal System:

Triclinic - PedialH-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),

Crystal Structure:

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Shumyatskaya N G , Voronkov A A , Ilyukhin V V , Belov N V , Soviet Physics - Crystallography , 21 (1976) p.399-405, Tundrite, Na2Ce2TiO2[SiO4](CO3)2 -, refinement of the crystal structure and chemical formula, Locality: Khibiny Massif, Kola Peninsula, Russia, Note: y(O11) adjusted to match reported bond lengths

Physical Properties of Tundrite-(Ce)

Cleavage:

None

Color:

Brownish yellow, Greenish yellow.

Density:

3.7

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Hardness:

3 - Calcite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Tundrite-(Ce)

Gladstone-Dale:

CI meas= -0.091 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.044 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1914,KPDmeas= 0.2183,KC= 0.2002

Optical Data:

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

Calculated Properties of Tundrite-(Ce)

Electron Density:

r_electron=3.85 gm/cc
note: r_{Tundrite-(Ce)}=4.22 gm/cc.

Fermion Index

Fermion Index = 0.01027
Boson Index = 0.98973

Photoelectric:

PE_{Tundrite-(Ce)}= 233.60 barns/electron
U=PE_{Tundrite-(Ce)} x r_electron= 900.10 barns/cc.

Radioactivity:

GRapi = 44,364.98 (Gamma Ray American Petroleum Institute Units)

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) 685.60 ±171.40 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 / 7.68 cm	1,020,362	2.76E-05	44,364.98	14.59
100 gm / 3.56 cm	102,036	2.76E-06	4,436.50	1.46
10 gm / 1.65 cm	10,204	2.76E-07	443.65	0.15
1 gm / 7.68 mm	1,020	2.76E-08	44.36	0.01
0.1 gm / 3.56 mm	102	2.76E-09	4.44	0.00
0.01 gm / 1.65 mm	10	2.76E-10	0.44	0.00
0.001 gm / 0.77 mm	1	2.76E-11	0.04	0.00

Weight of pure Tundrite-(Ce) in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.22 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 ( 2.28 % Th) From Sum REE Elements (45.55 % REE)

Tundrite-(Ce) Classification

Dana Class:

17.1.11.1 (17)Compound Carbonates

(17.1)with miscellaneous formulae

(17.1.11)Dana Group

17.1.11.1 Tundrite-(Ce) Na3(Ce,La)4(Ti,Nb)2(SiO4)2(CO3)3O4(OH)·2(H2O) P1 1

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

Strunz Class:

VIII/B.16-40 VIII - Silicates

VIII/B - Nesosubsilicates, with anions unfamiliar to tetraheders, cationes with coordinationnumber between [8] and [12]

VIII/B.16 - Ilmajokite - Tundrite-(Nd) series

VIII/B.16-20 Ilmajokite (Na,Ce,La,Ba)2TiSi3O5(OH)10·n(H2O)(?) C 2/c or Cc Mono

VIII/B.16-30 Sitinakite Na2K(Ti,Nb)4O4(SiO4)2(O,OH)·4(H2O) P 4₁/mcm 4/m 2/m 2/m

VIII/B.16-40 Tundrite-(Ce) Na3(Ce,La)4(Ti,Nb)2(SiO4)2(CO3)3O4(OH)·2(H2O) P1 1

VIII/B.16-50 Tundrite-(Nd) Na3(Nd,La)4(Ti,Nb)2(SiO4)2(CO3)3O4(OH)·2(H2O) P1 1

Other Tundrite-(Ce) Information

References:

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

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Print or Cut-and-Paste your Tundrite-(Ce) Specimen Label here :

Tundrite-(Ce)

Na3(Ce,La)4(Ti,Nb)2(SiO4)2(CO3)3O4(OH)·2(H2O)
Dana No: 17.1.11.1 Strunz No: VIII/B.16-40
Locality:

Notes: