Lanthanite-(Nd) Mineral Data

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General Lanthanite-(Nd) Information

Chemical Formula:

(Nd,La)2(CO3)3•8(H2O)

Composition:

Molecular Weight = 609.96 gm

Lanthanum 11.39 % La 13.35 % La₂O₃

Hydrogen 2.64 % H 23.63 % H₂O

Carbon 5.91 % C 21.65 % CO₂

Neodymium 35.47 % Nd 41.37 % Nd₂O₃

Oxygen 44.59 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Nd_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 1980

Locality:

Curitiba, Paraná, Brazil. Link to MinDat.org Location Data.

Name Origin:

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

Name Pronunciation:

Lanthanite-(Nd) + Pronunciation

Synonym:

Coutinhite

Coutinite

Neodymite

Lanthanite-(Nd) Image

Images:

Lanthanite-(Nd)

Comments: Beige aggregate of scaly, platy lanthanite-(Nd) crystals.
Location: Curitiba, Paranà, Brazil. Scale: 2.5 x 2 cm.
© Sandro Maggia/Minernet.it

Lanthanite-(Nd) Crystallography

Axial Ratios:

a:b:c =0.5593:1:0.5278

Cell Dimensions:

a = 9.476, b = 16.94, c = 8.942, Z = 4; V = 1,435.40 Den(Calc)= 2.82

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): 8.5(1), 3.252(0.63), 3.038(0.58),

Physical Properties of Lanthanite-(Nd)

Cleavage:

{010} Perfect, {101} Good

Color:

Light pink.

Density:

2.81

Diaphaneity:

Transparent

Fracture:

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

Habit:

Encrustations - Forms crust-like aggregates on matrix.

Habit:

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

Hardness:

2.5-3 - Finger Nail-Calcite

Luster:

Vitreous - Pearly

Streak:

white

Optical Properties of Lanthanite-(Nd)

Gladstone-Dale:

CI meas= -0.017 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.014 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2052,KPDmeas= 0.2059,KC= 0.2025
Ncalc = 1.57

Optical Data:

Biaxial (-), a=1.532, b=1.59, g=1.614, bire=0.0820, 2V(Calc)=62, 2V(Meas)=61.

Calculated Properties of Lanthanite-(Nd)

Electron Density:

Bulk Density (Electron Density)=2.67 gm/cc
note: Specific Gravity of Lanthanite-(Nd) =2.82 gm/cc.

Fermion Index:

Fermion Index = 0.07
Boson Index = 0.93

Photoelectric:

PE_{Lanthanite-(Nd)}= 248.46 barns/electron
U=PE_{Lanthanite-(Nd)} x r_electron= 662.80 barns/cc.

Radioactivity:

GRapi = 47,280.23 (Gamma Ray American Petroleum Institute Units)
Concentration of Lanthanite-(Nd) per GRapi unit = 21.15 (PPM)

Lanthanite-(Nd) 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) 643.33 ±160.83 grams of pure Lanthanite-(Nd) .

**Estimated Radioactivity from Lanthanite-(Nd)** - 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 / 8.78 cm	1,049,606	2.84E-05	47,280.23	15.54
100 gm / 4.08 cm	104,961	2.84E-06	4,728.02	1.55
10 gm / 1.89 cm	10,496	2.84E-07	472.80	0.16
1 gm / 8.78 mm	1,050	2.84E-08	47.28	0.02
0.1 gm / 4.08 mm	105	2.84E-09	4.73	0.00
0.01 gm / 1.89 mm	10	2.84E-10	0.47	0.00
0.001 gm / 0.88 mm	1	2.84E-11	0.05	0.00

Weight of pure Lanthanite-(Nd) in grams (gm) and Calculated Diameter of a Sphere with a Density of 2.82 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 ( 2.34 % Th) From Sum REE Elements (46.86 % REE)

Lanthanite-(Nd) Classification

Dana Class:

15.04.02.02 (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-(Nd) 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-(Nd) :
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

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Lanthanite-(Nd)

(Nd,La)2(CO3)3•8(H2O)
Dana No: 15.04.02.02 Strunz No: 05.CC.25
Locality:

Notes: