Petersenite-(Ce) Mineral Data

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General Petersenite-(Ce) Information

Chemical Formula:

(Na,Ca)4(Ce,La,Nd)2(CO3)5

Composition:

Molecular Weight = 672.29 gm

Sodium 12.65 % Na 17.06 % Na₂O

Strontium 1.30 % Sr 1.54 % SrO

Calcium 1.79 % Ca 2.50 % CaO

Lanthanum 12.40 % La 14.54 % La₂O₃

Cerium 20.84 % Ce 24.41 % Ce₂O₃

Praeseodymium 2.10 % Pr 2.45 % Pr₂O₃

Carbon 8.93 % C 32.73 % CO₂

Neodymium 4.29 % Nd 5.00 % Nd₂O₃

Oxygen 35.70 % O

______ ______

100.00 % 100.24 % = TOTAL OXIDE

Empirical Formula:

Na_3.7Ca_0.3CeLa_0.6Nd_0.2Sr_0.1Pr_0.1(CO₃)₅

Environment:

Rare accessory mineral in pegmatites in nepheline-sodalite syenites near a hornfels contact.

IMA Status:

Approved IMA 1994

Locality:

Mont Saint-Hilaire, Quebec, Canada. Link to MinDat.org Location Data.

Name Origin:

Named for Ole Valdemar Petersen (1939-), Curator, Geology Museum, Copenhagen, Denmark.

Name Pronunciation:

Petersenite-(Ce) + Pronunciation

Synonym:

ICSD 79144

IMA1992-048

PDF 46-1471

Petersenite-(Ce) Image

Images:

Petersenite-(Ce)

Comments: Reddish brown specks of petersenite-(Ce) in matrix.
Location: Mt. St. Hilaire, Quebec, Canada. Scale: Box Size 4 x 6 cm.
© Sonke Stolze / Systematic Minerals

Petersenite-(Ce) Crystallography

Axial Ratios:

a:b:c =3.2695:1:1.6595

Cell Dimensions:

a = 20.84, b = 6.374, c = 10.578, Z = 4; beta = 120.43° V = 1,211.56 Den(Calc)= 3.69

Crystal System:

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

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

By Intensity(I/I_o): 2.607(1), 5.22(0.5), 3.7(0.4),1.921(0.3), 2.148(0.3), 4.13(0.3), 9.13(0.3),

Crystal Structure:

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Grice J D , Velthuizen J V , Gault R A , The Canadian Mineralogist , 32 (1994) p.405-414, Petersenite-(Ce), a new mineral from Mont Saint-Hilaire, and its structural, relationship to other REE carbonates, Locality: Mont Saint-Hilaire, Quebec, Canada

Physical Properties of Petersenite-(Ce)

Cleavage:

None

Color:

Light violet, Light yellow, Pink gray, Reddish gray.

Density:

3.69

Diaphaneity:

Transparent to Translucent

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Habit:

Acicular - Occurs as needle-like crystals.

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Hardness:

3 - Calcite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Petersenite-(Ce)

Gladstone-Dale:

CI meas= 0.02 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.02 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1724,KPDmeas= 0.1724,KC= 0.1759
Ncalc = 1.65

Optical Data:

Biaxial (+/-), a=1.623, b=1.636, g=1.649, bire=0.0260, 2V(Calc)=88, 2V(Meas)=89.7-90.

Calculated Properties of Petersenite-(Ce)

Electron Density:

Bulk Density (Electron Density)=3.41 gm/cc
note: Specific Gravity of Petersenite-(Ce) =3.69 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_{Petersenite-(Ce)}= 199.47 barns/electron
U=PE_{Petersenite-(Ce)} x r_electron= 680.11 barns/cc.

Radioactivity:

GRapi = 39,054.88 (Gamma Ray American Petroleum Institute Units)
Concentration of Petersenite-(Ce) per GRapi unit = 25.60 (PPM)

Petersenite-(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) 778.82 ±194.70 grams of pure Petersenite-(Ce) .

**Estimated Radioactivity from Petersenite-(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 / 8.03 cm	887,606	2.40E-05	39,054.88	12.84
100 gm / 3.73 cm	88,761	2.40E-06	3,905.49	1.28
10 gm / 1.73 cm	8,876	2.40E-07	390.55	0.13
1 gm / 8.03 mm	888	2.40E-08	39.05	0.01
0.1 gm / 3.73 mm	89	2.40E-09	3.91	0.00
0.01 gm / 1.73 mm	9	2.40E-10	0.39	0.00
0.001 gm / 0.80 mm	1	2.40E-11	0.04	0.00

Weight of pure Petersenite-(Ce) in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.69 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 ( 1.98 % Th) From Sum REE Elements (39.63 % REE)

Petersenite-(Ce) Classification

Dana Class:

14.04.05.02 (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 Petersenite-(Ce) Information

References:

NAME( AntBidBlaNic5) PHYS. PROP.(Am.Min.,Vol.80,p406,1995) OPTIC PROP.(Am.Min.,Vol.80,p406,1995)

See Also:

Links to other databases for Petersenite-(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
15 - WWW-MINCRYST

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

Petersenite-(Ce)

(Na,Ca)4(Ce,La,Nd)2(CO3)5
Dana No: 14.04.05.02 Strunz No: 05.AD.15
Locality:

Notes: