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Rontgenite-(Ce) Mineral Data

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General Rontgenite-(Ce) Information

Help on Chemical  Formula: Chemical Formula: Ca2(Ce,La)3(CO3)5F3
Help on Composition: Composition: Molecular Weight = 856.64 gm
   Calcium     9.36 %  Ca   13.09 % CaO
   Lanthanum  12.16 %  La   14.26 % La2O3
   Cerium     36.80 %  Ce   43.11 % Ce2O3
   Carbon      7.01 %  C    25.69 % CO2
   Oxygen     28.02 %  O
   Fluorine    6.65 %  F     6.65 % F
                -   %   F    -2.80 % -O=F2    
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca2Ce2.25La0.75(CO3)5F3
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1953
Help on Locality: Locality: Narssarssuk, Greenland. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for William Conrad von Rontgen (1845-1923), German physicist and discoverer of X-rays.
Help on Name Pronunciation: Name Pronunciation: Rontgenite-(Ce) + Pronunciation Say RONTGENITE-(CE)
 

Rontgenite-(Ce) Image

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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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  Thorbastnasite   Rontgenite-(Ce)

Comments: Tny white, acicular thorbastnasite crystals to less than 1 mm in sprays. The thorbastnasite forms the cores the 'needles', with white epitaxial rontgenite-(Ce) coating.
Location: Mont Saint-Hilaire, Quebec, Canada. Scale: Needle Size < 1 mm.
© William Lechner / Dakota Matrix

Rontgenite-(Ce) Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:9.73352
Help on Cell Dimensions: Cell Dimensions: a = 7.13, c = 69.4, Z = 9; V = 3,055.41 Den(Calc)= 4.19
Help on Crystal System: Crystal System: Trigonal - Pyramidal H-M Symbol (3) Space Group: R 3
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 23.133(1), 11.567(0.7), 3.565(0.49),
 

Physical Properties of Rontgenite-(Ce)

Help on Color: Color: Yellow, Brown.
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Hardness: Hardness: 4.5 - Between Fluorite and Apatite
 

Optical Properties of Rontgenite-(Ce)

Help on Gladstone-Dale: Gladstone-Dale: CI calc= -0.007 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1692,KC= 0.168
Ncalc = 1.7
Help on Optical Data: Optical Data: Uniaxial (+), w=1.662, e=1.756, bire=0.0940.
 

Calculated Properties of Rontgenite-(Ce)

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.82 gm/cc
note: Specific Gravity of Rontgenite-(Ce) =4.19 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0011414107
Boson Index = 0.9988585893
Help on Photoelectric: Photoelectric: PERontgenite-(Ce) = 245.25 barns/electron
U=PERontgenite-(Ce) x relectron= 936.26 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 47,585.83 (Gamma Ray American Petroleum Institute Units)
Concentration of Rontgenite-(Ce) per GRapi unit = 21.01 (PPM)

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 1,096,781 2.96E-05 47,585.83 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)
 

Rontgenite-(Ce) Classification

Help on  Dana Class: Dana Class: 16a.01.06.01 (16a)Carbonates - Hydroxyl or Halogen
  (16a.01)in the Bastnasite/Shynchysite/Parasite Groups
  (16a.01.06)Dana Group
 
16a.01.06.01 Rontgenite-(Ce) Ca2(Ce,La)3(CO3)5F3 R 3 3
Help on  Strunz Class: Strunz Class: 05.BD.20d 05 - CARBONATES (NITRATES)
  05.B - Carbonates with additional anions, without H2O
  05.BD -With rare-earth elements (REE)
 
05.BD.20d Rontgenite-(Ce) Ca2(Ce,La)3(CO3)5F3 R 3 3
 

Other Rontgenite-(Ce) Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: 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 - 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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Print or Cut-and-Paste your Rontgenite-(Ce) Specimen Label here :

Rontgenite-(Ce)

Ca2(Ce,La)3(CO3)5F3
Dana No: 16a.01.06.01 Strunz No: 05.BD.20d
Locality:

 

Notes:

 

 
   
 


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