Parisite-(Nd) Mineral Data

General Parisite-(Nd) Information

Chemical Formula:

Ca(Nd,Ce,La)2(CO3)3F2

Composition:

Molecular Weight = 555.09 gm

Calcium 7.22 % Ca 10.10 % CaO

Lanthanum 20.02 % La 23.48 % La₂O₃

Cerium 10.10 % Ce 11.83 % Ce₂O₃

Carbon 6.49 % C 23.79 % CO₂

Neodymium 23.39 % Nd 27.28 % Nd₂O₃

Oxygen 25.94 % O

Fluorine 6.85 % F 6.85 % F

- % F -2.88 % -O=F₂

______ ______

100.00 % 100.43 % = TOTAL OXIDE

Empirical Formula:

CaNd_0.9Ce_0.4La_0.8(CO₃)₃F₂

IMA Status:

Approved IMA 1986

Locality:

Bayan Obo iron-rare earth deposit, Inner Mongolia, China. Link to MinDat.org Location Data.

Name Origin:

Named as the Nd-rich end member of the parisite series, named for J. J. Paris, mine proprietor at Muzon, north of Bogota, Columbia.

Name Pronunciation:

Parisite-(Nd)

Parisite-(Nd) Crystallography

Axial Ratios:

a:c = 1:1.96743

Cell Dimensions:

a = 7.125, c = 14.018, Z = 3; V = 616.29 Den(Calc)= 4.49

Crystal System:

Trigonal - Pyramidal H-M Symbol (3) Space Group: R 3

Physical Properties of Parisite-(Nd)

Cleavage:

{???} Good

Color:

Brownish yellow.

Density:

4.2 - 4.5, Average = 4.34

Diaphaneity:

Transparent

Hardness:

4-5 - Fluorite-Apatite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Parisite-(Nd)

Gladstone-Dale:

CI meas= -0.006 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.026 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1596,KPDmeas= 0.1647,KC= 0.1638
Ncalc = 1.69 - 1.74

Optical Data:

Uniaxial (+), w=1.679, e=1.754, bire=0.0750.

Calculated Properties of Parisite-(Nd)

Electron Density:

Bulk Density (Electron Density)=3.93 gm/cc
note: Specific Gravity of Parisite-(Nd) =4.35 gm/cc.

Fermion Index:

Fermion Index = 0.04
Boson Index = 0.96

Photoelectric:

PE_{Parisite-(Nd)}= 283.57 barns/electron
U=PE_{Parisite-(Nd)} x r_electron=1,114.68 barns/cc.

Radioactivity:

GRapi = 51,570.09 (Gamma Ray American Petroleum Institute Units)
Concentration of Parisite-(Nd) per GRapi unit = 19.39 (PPM)

Parisite-(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) 589.81 ±147.45 grams of pure Parisite-(Nd) .

**Estimated Radioactivity from Parisite-(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 / 7.60 cm	1,198,456	3.24E-05	51,570.09	16.95
100 gm / 3.53 cm	119,846	3.24E-06	5,157.01	1.70
10 gm / 1.64 cm	11,985	3.24E-07	515.70	0.17
1 gm / 7.60 mm	1,198	3.24E-08	51.57	0.02
0.1 gm / 3.53 mm	120	3.24E-09	5.16	0.00
0.01 gm / 1.64 mm	12	3.24E-10	0.52	0.00
0.001 gm / 0.76 mm	1	3.24E-11	0.05	0.00

Weight of pure Parisite-(Nd) in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.35 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 ( 2.68 % Th) From Sum REE Elements (53.50 % REE)

Parisite-(Nd) Classification

Dana Class:

16a.01.05.02 (16a)Carbonates - Hydroxyl or Halogen

(16a.01)in the Bastnasite/Shynchysite/Parasite Groups

(16a.01.05)Parisite Subgroup

16a.01.05.01 Parisite-(Ce) Ca(Ce,La)2(CO3)3F2 R 3 3

16a.01.05.02 Parisite-(Nd) Ca(Nd,Ce,La)2(CO3)3F2 R 3 3

Strunz Class:

05.BD.20b 05 - CARBONATES (NITRATES)

05.B - Carbonates with additional anions, without H2O

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

05.BD.20b Parisite-(Nd) Ca(Nd,Ce,La)2(CO3)3F2 R 3 3

05.BD.20b Parisite-(Ce) Ca(Ce,La)2(CO3)3F2 R 3 3

Other Parisite-(Nd) Information

References:

NAME( Dana8) PHYS. PROP.(Am.Min.,Vol.73,p1496,1988) OPTIC PROP.(Am.Min.,Vol.73,p1496,1988)

See Also:

Links to other databases for Parisite-(Nd) :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - GeoScienceWorld
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info

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Parisite-(Nd)

Ca(Nd,Ce,La)2(CO3)3F2
Dana No: 16a.01.05.02 Strunz No: 05.BD.20b
Locality:

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