Remondite-(Ce) Mineral Data

General Remondite-(Ce) Information

Chemical Formula:

Na3(Ce,La,Ca,Na,Sr)3(CO3)5

Composition:

Molecular Weight = 611.79 gm

Sodium 11.65 % Na 15.70 % Na₂O

Strontium 1.43 % Sr 1.69 % SrO

Calcium 1.31 % Ca 1.83 % CaO

Lanthanum 9.08 % La 10.65 % La₂O₃

Cerium 27.48 % Ce 32.19 % Ce₂O₃

Carbon 9.82 % C 35.97 % CO₂

Oxygen 39.23 % O

______ ______

100.00 % 98.04 % = TOTAL OXIDE

Empirical Formula:

Na₃Ce_1.2La_0.4Ca_0.2Na_0.1Sr_0.1(CO₃)₅

Environment:

Nepheline syenite.

IMA Status:

Approved IMA 1988

Locality:

Ebounja, near Kribi, Cameroon. Link to MinDat.org Location Data.

Name Origin:

Named for Guy Remond (1935-), physicist, Bureau de Recherches G�eologiques et Mini`eres, Orl�eans, France and the predominance of cerium over other rare-earth elements in the compos ition.

Name Pronunciation:

Remondite-(Ce) + Pronunciation

Synonym:

ICSD 65110

PDF 46-1268

Remondite-(Ce) Image

Images:

Remondite-(Ce)

Comments: Flesh-colored, acicular crystals of remondite-(Ce) in matrix.
Location: Mt. St. Hilaire, Quebec, Canada. Scale: Box Base 3 x 3 cm.
© Sonke Stolze / Systematic Minerals

Remondite-(Ce) Crystallography

Axial Ratios:

a:b:c =1.6543:1:1.6545

Cell Dimensions:

a = 10.444, b = 6.313, c = 10.445, Z = 3; beta = 119.86° V = 597.25 Den(Calc)= 5.10

Crystal System:

Monoclinic - Sphenoidal H-M Symbol (2) Space Group: P 2₁

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

By Intensity(I/I_o): 2.589(1), 2.609(0.7), 3.006(0.7),

Physical Properties of Remondite-(Ce)

Cleavage:

{???} Indistinct

Color:

Reddish orange.

Density:

3.43

Diaphaneity:

Transparent

Hardness:

3-3.5 - Calcite-Copper Penny

Luminescence:

Photochromic.

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Remondite-(Ce)

Gladstone-Dale:

CI meas= -0.062 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= 0.286 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1244,KPDmeas= 0.1849,KC= 0.1742
Ncalc = 1.6 - 1.89

Optical Data:

Biaxial (+), a=1.632, b=1.633, g=1.638, bire=0.0060, 2V(Calc)=50, 2V(Meas)=40-48.

Calculated Properties of Remondite-(Ce)

Electron Density:

Bulk Density (Electron Density)=3.19 gm/cc
note: Specific Gravity of Remondite-(Ce) =3.43 gm/cc.

Fermion Index:

Fermion Index = 0.0023700335
Boson Index = 0.9976299665

Photoelectric:

PE_{Remondite-(Ce)}= 180.66 barns/electron
U=PE_{Remondite-(Ce)} x r_electron= 575.92 barns/cc.

Radioactivity:

GRapi = 36,248.84 (Gamma Ray American Petroleum Institute Units)
Concentration of Remondite-(Ce) per GRapi unit = 27.59 (PPM)

Remondite-(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) 839.11 ±209.78 grams of pure Remondite-(Ce) .

**Estimated Radioactivity from Remondite-(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 / 8.23 cm	819,050	2.21E-05	36,248.84	11.92
100 gm / 3.82 cm	81,905	2.21E-06	3,624.88	1.19
10 gm / 1.77 cm	8,191	2.21E-07	362.49	0.12
1 gm / 8.23 mm	819	2.21E-08	36.25	0.01
0.1 gm / 3.82 mm	82	2.21E-09	3.62	0.00
0.01 gm / 1.77 mm	8	2.21E-10	0.36	0.00
0.001 gm / 0.82 mm	1	2.21E-11	0.04	0.00

Weight of pure Remondite-(Ce) in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.43 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 ( 1.83 % Th) From Sum REE Elements (36.56 % REE)

Remondite-(Ce) Classification

Dana Class:

14.04.05.01 (14)Anhydrous Carbonates

(14.04)with Compound Formula A+2 B++2 (CO3)4

(14.04.05)Burbankite Group (Monoclinic)

14.04.05.01 Remondite-(Ce) Na3(Ce,La,Ca,Na,Sr)3(CO3)5 P 2₁ 2

14.04.05.02 Petersenite-(Ce) (Na,Ca)4(Ce,La,Nd)2(CO3)5 P 2₁ 2

14.04.05.03 Remondite-(La)! Na3(La,Ce,Ca)3(CO3)5 P 2₁ 2

Strunz Class:

05.AD.15 05 - CARBONATES (NITRATES)

05.A - Carbonates without additional anions, without H2O

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

05.AD.15 Remondite-(Ce) Na3(Ce,La,Ca,Na,Sr)3(CO3)5 P 2₁ 2

05.AD.15 Petersenite-(Ce) (Na,Ca)4(Ce,La,Nd)2(CO3)5 P 2₁ 2

05.AD.15 Remondite-(La)! Na3(La,Ce,Ca)3(CO3)5 P 2₁ 2

Other Remondite-(Ce) Information

References:

NAME( AntBidBlaNic3) PHYS. PROP.(www.saint-hilaire.ca) OPTIC PROP.(Am.Min.,Vol.75,p433,1990)

See Also:

Links to other databases for Remondite-(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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Remondite-(Ce)

Na3(Ce,La,Ca,Na,Sr)3(CO3)5
Dana No: 14.04.05.01 Strunz No: 05.AD.15
Locality:

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