General Rontgenite-(Ce) Information
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Chemical Formula: |
Ca2(Ce,La)3(CO3)5F3 |
Composition: |
Molecular Weight = 856.64 gm |
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Calcium 9.36 % Ca 13.09 % CaO |
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Lanthanum 12.16 % La 14.26 % La2O3 |
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Cerium 36.80 % Ce 43.11 % Ce2O3 |
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Carbon 7.01 % C 25.69 % CO2 |
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Oxygen 28.02 % O |
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Fluorine 6.65 % F 6.65 % F |
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- % F -2.80 % -O=F2 |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
Empirical Formula: |
Ca2Ce2.25La0.75(CO3)5F3 |
IMA Status: |
Valid Species (Pre-IMA) 1953 |
Locality: |
Narssarssuk, Greenland. Link to MinDat.org Location Data. |
Name Origin: |
Named for William Conrad von Rontgen (1845-1923), German physicist and discoverer of X-rays. |
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Rontgenite-(Ce) Image |
Images:
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Rontgenite-(Ce)
Comments: Gemmy and lustrous rontgenite-(Ce) crystals to 1.5 mm on an albite matrix.
Location: Narsarsuk, Igaliko, Greenland.
Scale: 3.7 x 1.5 cm.
© John Veevaert |
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Rontgenite-(Ce) Crystallography
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Axial Ratios: |
a:c = 1:9.73352 |
Cell Dimensions: |
a = 7.13, c = 69.4, Z = 9; V = 3,055.41 Den(Calc)= 4.19 |
Crystal System: |
Trigonal - PyramidalH-M Symbol (3) Space Group: R 3 |
X Ray Diffraction: |
By Intensity(I/Io): 23.133(1), 11.567(0.7), 3.565(0.49), |
Crystal Structure:
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Donnay G , Donnay J D H , American Mineralogist , 38 (1953) p.932-963, The crystallography of bastnaesite, parasite, roentgenite, and synchisite
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Physical Properties of Rontgenite-(Ce)
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Color: |
Yellow, Brown. |
Diaphaniety: |
Transparent to Translucent |
Hardness: |
4.5 - Between Fluorite and Apatite |
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Optical Properties of Rontgenite-(Ce)
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Gladstone-Dale: |
CI calc= -0.007 (Superior) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.1692,KC= 0.168 |
Optical Data: |
Uniaxial (+), w=1.662, e=1.756, bire=0.0940. |
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Calculated Properties of Rontgenite-(Ce)
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Electron Density: |
relectron=3.82 gm/cc note: rRontgenite-(Ce) =4.19 gm/cc. |
Fermion Index |
Fermion Index = 0.00114 Boson Index = 0.99886 |
Photoelectric: |
PERontgenite-(Ce) = 245.25 barns/electron U=PERontgenite-(Ce) x relectron= 936.26 barns/cc. |
Radioactivity: |
GRapi = 47,585.77 (Gamma Ray American Petroleum Institute Units)
Rontgenite-(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)
639.20 ±159.80 grams of pure Rontgenite-(Ce) .
Estimated Radioactivity from Rontgenite-(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 / 7.70 cm |
1,096,780 |
2.96E-05 |
47,585.77 |
15.64 |
| 100 gm / 3.57 cm |
109,678 |
2.96E-06 |
4,758.58 |
1.56 |
| 10 gm / 1.66 cm |
10,968 |
2.96E-07 |
475.86 |
0.16 |
| 1 gm / 7.70 mm |
1,097 |
2.96E-08 |
47.59 |
0.02 |
| 0.1 gm / 3.57 mm |
110 |
2.96E-09 |
4.76 |
0.00 |
| 0.01 gm / 1.66 mm |
11 |
2.96E-10 |
0.48 |
0.00 |
| 0.001 gm / 0.77 mm |
1 |
2.96E-11 |
0.05 |
0.00 |
Weight of pure Rontgenite-(Ce) in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.19 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 ( 2.45 % Th) From Sum REE Elements (48.96 % REE)
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Rontgenite-(Ce) Classification
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Dana Class: |
16a.1.6.1 (16a)Carbonates - Hydroxyl or Halogen |
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(16a.1)in the Bastnasite/Shynchysite/Parasite Groups |
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(16a.1.6)Dana Group |
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16a.1.6.1 Rontgenite-(Ce) Ca2(Ce,La)3(CO3)5F3 R 3 3 |
Strunz Class: |
V/C.07-90 V - Nitrates, Carbonates and Borates |
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V/C - Waterfree carbonates with unfamiliar anions |
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V/C.07 - Bastnäsite-(Y) - Mineevite-(Y) series |
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V/C.07-10 Bastnasite-(Y) Y(CO3)F P 62c 6 m2 |
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V/C.07-20 Bastnasite-(La) La(CO3)F P 62c 6 m2 |
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V/C.07-30 Bastnasite-(Ce) Ce(CO3)F P 62c 6 m2 |
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V/C.07-40 Hydroxylbastnasite-(La) La(CO3)(OH) C 2221 2 2 2 |
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V/C.07-50 Hydroxylbastnasite-(Ce) Ce(CO3)(OH) P 62c 6 m2 |
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V/C.07-60 Hydroxylbastnasite-(Nd) Nd(CO3)(OH) P 62c 6 m2 |
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V/C.07-61 Kozoite-(Nd)! (Nd,La,Sm,Pr)(CO3)(OH) Pmcn 2/m 2/m 2/m |
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V/C.07-62 Kozoite-(La)! La(CO3)(OH) Pmcn 2/m 2/m 2/m |
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V/C.07-64 Horvathite-(Y)! NaY(CO3)F2 Pmcn 2/m 2/m 2/m |
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V/C.07-70 Parisite-(Ce) Ca(Ce,La)2(CO3)3F2 R 3 3 |
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V/C.07-80 Parisite-(Nd) Ca(Nd,Ce,La)2(CO3)3F2 R 3 3 |
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V/C.07-90 Rontgenite-(Ce) Ca2(Ce,La)3(CO3)5F3 R 3 3 |
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V/C.07-100 Synchysite-(Y) CaY(CO3)2F C 2/c 2/m |
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V/C.07-110 Synchysite-(Ce) CaCe(CO3)2F C 2/c 2/m |
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V/C.07-120 Synchysite-(Nd) CaNd(CO3)2F Unk Ortho |
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V/C.07-130 Huanghoite-(Ce) BaCe(CO3)2F R 3m 3 2/m |
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V/C.07-140 Cebaite-(Ce) Ba3Ce2(CO3)5F2 C 2/m or C 2 Mono |
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V/C.07-150 Cebaite-(Nd)! Ba3(Nd,Ce)2(CO3)5F2 Unk Mono |
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V/C.07-154 Kukharenkoite-(La)! Ba2(La,Ce)(CO3)3F P 21/m 2/m |
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V/C.07-155 Kukharenkoite-(Ce)! Ba2Ce(CO3)3F P 21/m 2/m |
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V/C.07-160 Zhonghuacerite-(Ce) Ba2Ce(CO3)3F P 21/m 2/m |
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V/C.07-170 Cordylite-(Ce) Ba(Ce,La)2(CO3)3F2 P 63/mmc 6/m 2/m 2/m |
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V/C.07-175 Lukechangite-(Ce)! Na3Ce2(CO3)4F P 63/mmc 6/m 2/m 2/m |
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V/C.07-190 Mineevite-(Y) Na25Ba(Y,Gd,Dy)2(HCO3)4(CO3)11(SO4)2ClF2 P 63/m 6/m |
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V/C.07-200 Reederite-(Y)! Na15Y2(CO3)9(SO3F)Cl P 6 6 |
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V/C.07-210 Micheelsenite! (Ca,Y)3Al[PO3OH,CO3](CO3)(OH)6·12(H2O) P 63 6 |
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Other Rontgenite-(Ce) Information
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References: |
NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990) |
See Also: |
Links to other databases for Rontgenite-(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
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Print or Cut-and-Paste your Rontgenite-(Ce) Specimen Label here :
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Rontgenite-(Ce)
Ca2(Ce,La)3(CO3)5F3
Dana No: 16a.1.6.1 Strunz No: V/C.07-90
Locality:
Notes:
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