Lanthanite-(Ce) Mineral Data

Lanthanite-(Ce) Mineral Data +

General Lanthanite-(Ce) Information

Chemical Formula:

(Ce,La)2(CO3)3·8(H2O)

Composition:

Molecular Weight = 603.78 gm

Lanthanum 11.50 % La 13.49 % La₂O₃

Cerium 34.81 % Ce 40.77 % Ce₂O₃

Hydrogen 2.67 % H 23.87 % H₂O

Carbon 5.97 % C 21.87 % CO₂

Oxygen 45.05 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ce_1.5La_0.5(CO₃)₃·8(H₂O)

Environment:

Rare secondary mineral typically formed by alteration or weathering from earlier rare-earth-element-bearing minerals.

IMA Status:

Approved IMA 1985

Locality:

Britannia mine, Snowdon, Caernarvonshire (Gwynedd), Wales. Link to MinDat.org Location Data.

Name Origin:

Named for its relationship to lanthanite-(La) and the cerium content.

Synonym:

ICSD 100027

PDF 38-377

Lanthanite-(Ce) Image

Images:

Lanthanite-(Ce)

Comments: Brownish, square crystals of lanthanite-(Ce) ?.
Location: Curitiba, Parana, Brazil. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Lanthanite-(Ce) Crystallography

Axial Ratios:

a:b:c =0.5598:1:0.5292

Cell Dimensions:

a = 9.482, b = 16.938, c = 8.965, Z = 4; V = 1,439.83 Den(Calc)= 2.79

Crystal System:

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

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

By Intensity(I/I_o): 8.47(1), 3.255(0.73), 4.746(0.65),

Crystal Structure:

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Dal Negro A , Rossi G , Tazzoli V , American Mineralogist , 62 (1977) p.142-146, The crystal structure of lanthanite, Locality: Bastnas mine, Vastmanland, Sweden

Physical Properties of Lanthanite-(Ce)

Cleavage:

[010] Good

Color:

Colorless.

Density:

2.76

Diaphaniety:

Transparent

Fracture:

Sectile - Curved shavings or scrapings produced by a knife blade, (e.g. graphite).

Habit:

Platy - Sheet forms (e.g. micas).

Hardness:

2.5 - Finger Nail

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Lanthanite-(Ce)

Gladstone-Dale:

CI meas= -0.021 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.01 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2081,KPDmeas= 0.2104,KC= 0.206

Optical Data:

Biaxial (-), a=1.532, b=1.594, g=1.616, bire=0.0840, 2V(Calc)=58, 2V(Meas)=60. Dispersion r < v weak.

Calculated Properties of Lanthanite-(Ce)

Electron Density:

r_electron=2.64 gm/cc
note: r_{Lanthanite-(Ce)}=2.79 gm/cc.

Fermion Index

Fermion Index = 0.00098
Boson Index = 0.99902

Photoelectric:

PE_{Lanthanite-(Ce)}= 222.40 barns/electron
U=PE_{Lanthanite-(Ce)} x r_electron= 586.82 barns/cc.

Radioactivity:

GRapi = 46,718.69 (Gamma Ray American Petroleum Institute Units)

Lanthanite-(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) 651.06 ±162.76 grams of pure Lanthanite-(Ce) .

**Estimated Radioactivity from Lanthanite-(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 / 8.81 cm	1,037,407	2.80E-05	46,718.69	15.36
100 gm / 4.09 cm	103,741	2.80E-06	4,671.87	1.54
10 gm / 1.90 cm	10,374	2.80E-07	467.19	0.15
1 gm / 8.81 mm	1,037	2.80E-08	46.72	0.02
0.1 gm / 4.09 mm	104	2.80E-09	4.67	0.00
0.01 gm / 1.90 mm	10	2.80E-10	0.47	0.00
0.001 gm / 0.88 mm	1	2.80E-11	0.05	0.00

Weight of pure Lanthanite-(Ce) in grams (gm) and Calculated Diameter of a Sphere with a Density of 2.79 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 ( 2.32 % Th) From Sum REE Elements (46.31 % REE)

Lanthanite-(Ce) Classification

Dana Class:

15.4.2.3 (15)Hydrated Carbonates

(15.4)Dana Type

(15.4.2)Dana Group

15.4.2.1 Lanthanite-(La) (La,Ce)2(CO3)3·8(H2O) Pbnb 2/m 2/m 2/m

15.4.2.2 Lanthanite-(Nd) (Nd,La)2(CO3)3·8(H2O) Pbnb 2/m 2/m 2/m

15.4.2.3 Lanthanite-(Ce) (Ce,La)2(CO3)3·8(H2O) Pbnb 2/m 2/m 2/m

Strunz Class:

V/D.03-30 V - Nitrates, Carbonates and Borates

V/D - Water-bearing carbonates without unfamiliar anions

V/D.03 - Calkinsite-(Ce) - Lokkaite-(Y) series

V/D.03-02 Adamsite-(Y)! NaY(CO3)2·6(H2O) P1 1

V/D.03-05 Shomiokite-(Y) Na3Y(CO3)3·3(H2O) Pbn21 mm2

V/D.03-10 Calkinsite-(Ce) (Ce,La)2(CO3)3·4(H2O) P 2₁221 2 2 2

V/D.03-20 Lanthanite-(La) (La,Ce)2(CO3)3·8(H2O) Pbnb 2/m 2/m 2/m

V/D.03-30 Lanthanite-(Ce) (Ce,La)2(CO3)3·8(H2O) Pbnb 2/m 2/m 2/m

V/D.03-40 Lanthanite-(Nd) (Nd,La)2(CO3)3·8(H2O) Pbnb 2/m 2/m 2/m

V/D.03-45 Tengerite-(Y) Y2(CO3)3·2-3(H2O) Pb21m mm2

V/D.03-50 Kimuraite-(Y) CaY2(CO3)4·6(H2O) Imm2,I mmm,I 222,I 2₁2₁2₁ Ortho

V/D.03-55 Galgenbergite-(Ce)! Ca(REE)2(CO3)4·(H2O) P1 1

V/D.03-60 Lokkaite-(Y) CaY4(CO3)7·9(H2O) Pb2m mm2

Other Lanthanite-(Ce) Information

References:

NAME( AntBidBlaNic5) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

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

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Lanthanite-(Ce)

(Ce,La)2(CO3)3·8(H2O)
Dana No: 15.4.2.3 Strunz No: V/D.03-30
Locality:

Notes: