Lanthanite-(La) Mineral Data

General Lanthanite-(La) Information

Chemical Formula:

(La,Ce)2(CO3)3•8(H2O)

Composition:

Molecular Weight = 602.57 gm

Lanthanum 34.58 % La 40.55 % La₂O₃

Cerium 11.63 % Ce 13.62 % Ce₂O₃

Hydrogen 2.68 % H 23.92 % H₂O

Carbon 5.98 % C 21.91 % CO₂

Oxygen 45.14 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

La_1.5Ce_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:

Valid Species (Pre-IMA) 1845

Locality:

Bastnäs, Riddarhyttan, Västmanland, Sweden. Link to MinDat.org Location Data.

Name Origin:

Named for the dominant lanthanum in the composition. From the Greek, lanthanein = "to lie hidden."

Name Pronunciation:

Lanthanite-(La) + Pronunciation

Synonym:

Coutinhite

Coutinite

Neodymite

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Lanthanite-(La) Crystallography

Axial Ratios:

a:b:c =0.5609:1:0.5274

Cell Dimensions:

a = 9.504, b = 16.943, c = 8.937, Z = 4; V = 1,439.09 Den(Calc)= 2.78

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): 3.12(1), 9.1(0.9), 4.6(0.7),

Forms:

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Forms: ( 0 1 0) ( 1 2 1) ( 1 2 0) ( 1 0 0) ( 0 0 1)

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Crystal Structure:

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Shinn D B , Eick H A , Inorganic Chemistry , 7 (1968) p.1340-1345, The crystal structure of lanthanum carbonate octahydrate, Locality: synthetic

Physical Properties of Lanthanite-(La)

Cleavage:

{???} Perfect

Color:

Colorless, Yellowish, Yellowish white, White, Pink.

Density:

2.61

Diaphaneity:

Transparent

Fracture:

Micaceous - Fracture of flexable micaceous cleavage fragments.

Habit:

Earthy - Dull, clay-like texture with no visible crystalline affinities, (e.g. howlite).

Habit:

Granular - Generally occurs as anhedral to subhedral crystals in matrix.

Hardness:

3 - Calcite

Luminescence:

Non-fluorescent.

Luster:

Pearly

Streak:

white

Optical Properties of Lanthanite-(La)

Gladstone-Dale:

CI meas= -0.06 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= 0.005 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2062,KPDmeas= 0.2197,KC= 0.2072
Ncalc = 1.54 - 1.58

Optical Data:

Biaxial (-), a=1.52, b=1.587, g=1.613, bire=0.0930, 2V(Calc)=60, 2V(Meas)=63. Dispersion relatively weak.

Calculated Properties of Lanthanite-(La)

Electron Density:

Bulk Density (Electron Density)=2.63 gm/cc
note: Specific Gravity of Lanthanite-(La) =2.78 gm/cc.

Fermion Index:

Fermion Index = 0.0011896789
Boson Index = 0.9988103211

Photoelectric:

PE_{Lanthanite-(La)}= 214.44 barns/electron
U=PE_{Lanthanite-(La)} x r_electron= 562.95 barns/cc.

Radioactivity:

GRapi = 46,539.97 (Gamma Ray American Petroleum Institute Units)
Concentration of Lanthanite-(La) per GRapi unit = 21.49 (PPM)

Lanthanite-(La) 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) 653.56 ±163.39 grams of pure Lanthanite-(La) .

**Estimated Radioactivity from Lanthanite-(La)** - weak
Specimen Size Weight/Volume (Sphere) *	Calculated Activity Becquerels (Bq)	Calculated Activity Curies (Ci)	Estimated Activity GR(api)	Estimated Exposure (mRem**)/hr If Held in Hand For One Hour
1000 gm / 8.82 cm	1,034,993	2.80E-05	46,539.97	15.30
100 gm / 4.10 cm	103,499	2.80E-06	4,654.00	1.53
10 gm / 1.90 cm	10,350	2.80E-07	465.40	0.15
1 gm / 8.82 mm	1,035	2.80E-08	46.54	0.02
0.1 gm / 4.10 mm	103	2.80E-09	4.65	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-(La) in grams (gm) and Calculated Diameter of a Sphere with a Density of 2.78 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 ( 2.31 % Th) From Sum REE Elements (46.21 % REE)

Lanthanite-(La) Classification

Dana Class:

15.04.02.01 (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-(La) 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-(La) :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - GeoScienceWorld
5 - Google Images
6 - Google Scholar
7 - MinDAT
8 - Mineralienatlas (Deutsch)
9 - Online Mineral Museum
10 - QUT Mineral Atlas
11 - Ruff.Info
12 - WWW-MINCRYST

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

Lanthanite-(La)

(La,Ce)2(CO3)3•8(H2O)
Dana No: 15.04.02.01 Strunz No: 05.CC.25
Locality:

Notes: