General Petersenite-(Ce) Information
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Chemical Formula: |
(Na,Ca)4(Ce,La,Nd)2(CO3)5 |
Composition: |
Molecular Weight = 672.29 gm |
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Sodium 12.65 % Na 17.06 % Na2O |
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Strontium 1.30 % Sr 1.54 % SrO |
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Calcium 1.79 % Ca 2.50 % CaO |
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Lanthanum 12.40 % La 14.54 % La2O3 |
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Cerium 20.84 % Ce 24.41 % Ce2O3 |
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Praeseodymium 2.10 % Pr 2.45 % Pr2O3 |
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Carbon 8.93 % C 32.73 % CO2 |
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Neodymium 4.29 % Nd 5.00 % Nd2O3 |
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Oxygen 35.70 % O |
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______ ______ |
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100.00 % 100.24 % = TOTAL OXIDE |
Empirical Formula: |
Na3.7Ca0.3CeLa0.6Nd0.2Sr0.1Pr0.1(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. |
Synonym: |
ICSD 79144 |
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IMA1992-048 |
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PDF 46-1471 |
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Images:
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Petersenite-(Ce) Crystallography
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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 |
X Ray Diffraction: |
By Intensity(I/Io): 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
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Physical Properties of Petersenite-(Ce)
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Cleavage: |
None |
Color: |
Light violet, Light yellow, Pink gray, Reddish gray. |
Density: |
3.69 |
Diaphaniety: |
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 |
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Optical Properties of Petersenite-(Ce)
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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 |
Optical Data: |
Biaxial (+/-), a=1.623, b=1.636, g=1.649, bire=0.0260, 2V(Calc)=88, 2V(Meas)=89.7-90. |
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Calculated Properties of Petersenite-(Ce)
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Electron Density: |
relectron=3.41 gm/cc note: rPetersenite-(Ce) =3.69 gm/cc. |
Fermion Index |
Fermion Index = 0.01098 Boson Index = 0.98902 |
Photoelectric: |
PEPetersenite-(Ce) = 199.47 barns/electron U=PEPetersenite-(Ce) x relectron= 680.11 barns/cc. |
Radioactivity: |
GRapi = 39,054.87 (Gamma Ray American Petroleum Institute Units)
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 |
39,054.87 |
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)
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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)
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Petersenite-(Ce) Classification
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Dana Class: |
14.4.5.2 (14)Anhydrous Carbonates |
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(14.4)with Compound Formula A+2 B++2 (CO3)4 |
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(14.4.5)Burbankite Group (Monoclinic) |
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14.4.5.1 Remondite-(Ce) Na3(Ce,La,Ca,Na,Sr)3(CO3)5 P 21 2 |
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14.4.5.2 Petersenite-(Ce) (Na,Ca)4(Ce,La,Nd)2(CO3)5 P 21 2 |
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14.4.5.3 Remondite-(La)! Na3(La,Ce,Ca)3(CO3)5 P 21 2 |
Strunz Class: |
V/B.05-95 V - Nitrates, Carbonates and Borates |
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V/B - Waterfree carbonates [CO3]2- without unfamiliar anions |
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V/B.05 - Eitelie - Shortite - Carbocernaite series |
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V/B.05-10 Eitelite Na2Mg(CO3)2 R 3 3 |
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V/B.05-20 Nyerereite Na2Ca(CO3)2 C mc21 mm2 |
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V/B.05-30 Natrofairchildite Na2Ca(CO3)2 P 63/mmc 6/m 2/m 2/m |
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V/B.05-40 Gregoryite (Na2,K2,Ca)CO3 P 63mc 6mm |
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V/B.05-50 Fairchildite K2Ca(CO3)2 P 63/mmc 6/m 2/m 2/m |
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V/B.05-55 Zemkorite (Na,K)2Ca(CO3)2 P 63/mmc, P 63mc, P 62c- Hex |
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V/B.05-60 Butschliite K2Ca(CO3)2 R 3m 3 2/m |
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V/B.05-70 Shortite Na2Ca2(CO3)3 Amm2 mm2 |
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V/B.05-80 Sahamalite-(Ce) (Mg,Fe)Ce2(CO3)4 P 21/a 2/m |
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V/B.05-90 Remondite-(Ce) Na3(Ce,La,Ca,Na,Sr)3(CO3)5 P 21 2 |
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V/B.05-92 Remondite-(La)! Na3(La,Ce,Ca)3(CO3)5 P 21 2 |
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V/B.05-95 Petersenite-(Ce) (Na,Ca)4(Ce,La,Nd)2(CO3)5 P 21 2 |
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V/B.05-98 Calcioburbankite Na3(Ca,REE,Sr)3(CO3)5 P 63mc 6mm |
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V/B.05-100 Burbankite (Na,Ca)3(Sr,Ba,Ce)3(CO3)5 P 63/mmc 6/m 2/m 2/m |
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V/B.05-110 Khanneshite (NaCa)3(Ba,Sr,Ce,Ca)3(CO3)5 P 63mc 6mm |
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V/B.05-120 Carbocernaite (Ca,Na)(Sr,Ce,Ba)(CO3)2 P mc21 mm2 |
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Other Petersenite-(Ce) Information
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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 -Google Images
7 -Google Scholar
8 -Handbook of Mineralogy (UofA)
9 -MinDAT
10 -MinMax(Deutsch)
11 -MinMax(English)
12 -Mineralienatlas (Deutsch)
13 -QUT Mineral Atlas
14 - WWW-MINCRYST
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Print or Cut-and-Paste your Petersenite-(Ce) Specimen Label here :
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Petersenite-(Ce)
(Na,Ca)4(Ce,La,Nd)2(CO3)5
Dana No: 14.4.5.2 Strunz No: V/B.05-95
Locality:
Notes:
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