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.

Name Pronunciation:

Lanthanite-(Ce) + Pronunciation

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 - Dipyramidal H-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),

Physical Properties of Lanthanite-(Ce)

Cleavage:

{010} Good

Color:

Colorless.

Density:

2.76

Diaphaneity:

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
Ncalc = 1.57

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:

Bulk Density (Electron Density)=2.64 gm/cc
note: Specific Gravity of Lanthanite-(Ce) =2.79 gm/cc.

Fermion Index:

Fermion Index = 0.0009802402
Boson Index = 0.9990197598

Photoelectric:

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

Radioactivity:

GRapi = 46,718.71 (Gamma Ray American Petroleum Institute Units)
Concentration of Lanthanite-(Ce) per GRapi unit = 21.40 (PPM)

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	46,718.71	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:

15.04.02.03 (15)Hydrated Carbonates

(15.04)Dana Type

(15.04.02)Lanthanite Series

15.04.02.01 Lanthanite-(La) (La,Ce)2(CO3)3•8(H2O) Pbnb 2/m 2/m 2/m

15.04.02.02 Lanthanite-(Nd) (Nd,La)2(CO3)3•8(H2O) Pbnb 2/m 2/m 2/m

15.04.02.03 Lanthanite-(Ce) (Ce,La)2(CO3)3•8(H2O) Pbnb 2/m 2/m 2/m

Strunz Class:

05.CC.25 05 - CARBONATES (NITRATES)

05.C - Carbonates without Additional Anions, with H2O

05.CC -With rare-earth elements (REE)

05.CC.25 Calkinsite-(Ce) (Ce,La)2(CO3)3•4(H2O) P 2₁221 2 2 2

05.CC.25 Lanthanite-(Ce) (Ce,La)2(CO3)3•8(H2O) Pbnb 2/m 2/m 2/m

05.CC.25 Lanthanite-(La) (La,Ce)2(CO3)3•8(H2O) Pbnb 2/m 2/m 2/m

05.CC.25 Lanthanite-(Nd) (Nd,La)2(CO3)3•8(H2O) Pbnb 2/m 2/m 2/m

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 - 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

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

Lanthanite-(Ce)

(Ce,La)2(CO3)3•8(H2O)
Dana No: 15.04.02.03 Strunz No: 05.CC.25
Locality:

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