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Percleveite-(Ce) Mineral Data

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General Percleveite-(Ce) Information

Help on Chemical  Formula: Chemical Formula: (Ce,La,Nd)2Si2O7
Help on Composition: Composition: Molecular Weight = 442.72 gm
   Lanthanum      12.86 %  La   15.09 % La2O3
   Cerium         27.53 %  Ce   32.25 % Ce2O3
   Praeseodymium   2.86 %  Pr    3.35 % Pr2O3
   Samarium        2.38 %  Sm    2.76 % Sm2O3
   Gadolinium      2.13 %  Gd    2.46 % Gd2O3
   Dysprosium      0.37 %  Dy    0.42 % Dy2O3
   Yttrium         2.41 %  Y     3.06 % Y2O3
   Silicon        12.75 %  Si   27.28 % SiO2
   Neodymium      11.40 %  Nd   13.30 % Nd2O3
   Oxygen         25.30 %  O
                 ______        ______ 
                 100.00 %       99.96 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ce0.87La0.41Nd0.35Y0.12Pr0.09Sm0.07Gd0.06Dy0.01Si2.01O7
Help on Environment: Environment: Minor grain in cerite-(Ce) ore with magnetite, chalcopyrite and clinoamphibole. Isostructural with Ln2Si2O7.
Help on IMA Status: IMA Status: Approved IMA 2003 (Dana # Added)
Help on Locality: Locality: Museum sepcimen of cerium-rich ore from the Bastnas deposit, Skinnskatteberg district, Vastmanland, Sweden. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Per Theodor Cleve (1840-1905), discoverer of Holmium (Ho) and Thulium (Tm).
Help on Synonym: Synonym: IMA2002-023
 

Percleveite-(Ce) Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:3.6409
Help on Cell Dimensions: Cell Dimensions: a = 6.781, c = 24.689, Z = 8; V = 1,135.25 Den(Calc)= 5.18
Help on Crystal System: Crystal System: Tetragonal - Pyramidal H-M Symbol (4) Space Group: P 41
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.084(1)(008), 3.271(0.31)(202), 3.135(0.27)(203),3.121(0.24)(116), 2.034(0.19)(219), 2.846(0.18)(213), 3.011(0.18),
 

Physical Properties of Percleveite-(Ce)

Help on Cleavage: Cleavage: {001} Imperfect
Help on Color: Color: White, Colorless, Yellowish gray.
Help on Diaphaneity: Diaphaneity: Transparent
Help on Habit: Habit: Anhedral Grains - Granular minerals without the expression of crystal shapes
Help on Hardness: Hardness: 6 - Orthoclase
Help on Luster: Luster: Resinous
Help on Streak: Streak: white
 

Optical Properties of Percleveite-(Ce)

Help on Gladstone-Dale: Gladstone-Dale: CI calc= -0.012 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1627,KC= 0.1608
Ncalc = 1.83
Help on Optical Data: Optical Data: Uniaxial (+), w=1.84, e=1.846, bire=0.0060.
 

Calculated Properties of Percleveite-(Ce)

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.63 gm/cc
note: Specific Gravity of Percleveite-(Ce) =5.18 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.05
Boson Index = 0.95
Help on Photoelectric: Photoelectric: PEPercleveite-(Ce) = 324.61 barns/electron
U=PEPercleveite-(Ce) x relectron=1,502.52 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 56,880.15 (Gamma Ray American Petroleum Institute Units)
Concentration of Percleveite-(Ce) per GRapi unit = 17.58 (PPM)

Percleveite-(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) 534.75 ±133.69 grams of pure Percleveite-(Ce) .

Estimated Radioactivity from Percleveite-(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 / 7.17 cm 1,336,754 3.61E-05 56,880.15 18.70
100 gm / 3.33 cm 133,675 3.61E-06 5,688.02 1.87
10 gm / 1.54 cm 13,368 3.61E-07 568.80 0.19
1 gm / 7.17 mm 1,337 3.61E-08 56.88 0.02
0.1 gm / 3.33 mm 134 3.61E-09 5.69 0.00
0.01 gm / 1.54 mm 13 3.61E-10 0.57 0.00
0.001 gm / 0.72 mm 1 3.61E-11 0.06 0.00

Weight of pure Percleveite-(Ce) in grams (gm) and Calculated Diameter of a Sphere with a Density of 5.18 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 ( 2.98 % Th) From Sum REE Elements (59.54 % REE)
 

Percleveite-(Ce) Classification

Help on  Dana Class: Dana Class: 55.02.04.01 (55)Sorosilicate Si2O7 Groups, Generally with No Additional Anions
  (55.02)with cations in [6] coordination
  (55.02.04)Dana Group
 
55.02.04.01 Percleveite-(Ce)! (Ce,La,Nd)2Si2O7 P 41 4
Help on  Strunz Class: Strunz Class: 09.BC.35 09 - SILICATES (Germanates)
  09.B - Sorosilicates
  09.BC -Si2O7 groups, without non-tetrahedral anions;
 
09.BC.35 Percleveite-(Ce)! (Ce,La,Nd)2Si2O7 P 41 4
 

Other Percleveite-(Ce) Information

Help on References: References: NAME( AmMin, v 89, p 469) PHYS. PROP.(AmMin, v 89, p 469) OPTIC PROP.(AmMin, v 89, p 469)
Help on See Also: See Also: Links to other databases for Percleveite-(Ce) :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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

Percleveite-(Ce)

(Ce,La,Nd)2Si2O7
Dana No: 55.02.04.01 Strunz No: 09.BC.35
Locality:

 

Notes:

 

 
   
 


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