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Peprossiite-(Ce) Mineral Data

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General Peprossiite-(Ce) Information

Help on Chemical  Formula: Chemical Formula: (Ce,La)(Al3O)2/3B4O10
Help on Composition: Composition: Molecular Weight = 407.67 gm
   Lanthanum   8.52 %  La    9.99 % La2O3
   Cerium     25.78 %  Ce   30.19 % Ce2O3
   Aluminum   13.24 %  Al   25.01 % Al2O3
   Boron      10.61 %  B    34.15 % B2O3
   Oxygen     41.86 %  O
             ______        ______ 
             100.00 %       99.34 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ce0.75La0.250.66(Al3)0.66(O)B4O10
Help on IMA Status: IMA Status: Approved IMA 1993
Help on Locality: Locality: Sacrofanto, Sabatini complex, Campanano, Lazio (Latium), Italy Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Giuseppe "PEP" = Rossi (1938-1990), Italian crystallographer and mineralogist.
Help on Synonym: Synonym: ICSD 89817
  IMA1990-002
  IMA1999-B
  PDF 47-1824
 

Peprossiite-(Ce) Image

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  Peprossiite-(Ce)

Comments: Yellow grains of peprossiite-(Ce) on matrix.
Location: Sacrofano Caldera, Campagnano, Lazio, Italy. Scale: Specimen Size 11x4x4 mm.
© Sergey Vasiliev / Systematic Mineralogy

Peprossiite-(Ce) Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:2.02993
Help on Cell Dimensions: Cell Dimensions: a = 4.61, c = 9.358, Z = 1; V = 172.23 Den(Calc)= 3.93
Help on Crystal System: Crystal System: Hexagonal - Ditrigonal Dipyramidal H-M Symbol (6 m2) Space Group: P 62m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.04(1), 3.67(1), 2.458(0.75),
 

Physical Properties of Peprossiite-(Ce)

Help on Cleavage: Cleavage: {???} Perfect
Help on Color: Color: Brownish yellow, Light yellow, Lemon.
Help on Density: Density: 3.45
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Hardness: Hardness: 2 - Gypsum
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white
 

Optical Properties of Peprossiite-(Ce)

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.117 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.019 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1799,KPDmeas= 0.2049,KC= 0.1835
Ncalc = 1.63 - 1.72
Help on Optical Data: Optical Data: Uniaxial (+), w=1.703, e=1.711, bire=0.0080.
 

Calculated Properties of Peprossiite-(Ce)

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.65 gm/cc
note: Specific Gravity of Peprossiite-(Ce) =3.93 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PEPeprossiite-(Ce) = 168.30 barns/electron
U=PEPeprossiite-(Ce) x relectron= 613.54 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 33,933.97 (Gamma Ray American Petroleum Institute Units)
Concentration of Peprossiite-(Ce) per GRapi unit = 29.47 (PPM)

Peprossiite-(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) 896.35 ±224.09 grams of pure Peprossiite-(Ce) .

Estimated Radioactivity from Peprossiite-(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 / 7.86 cm 768,221 2.08E-05 33,933.97 11.16
100 gm / 3.65 cm 76,822 2.08E-06 3,393.40 1.12
10 gm / 1.69 cm 7,682 2.08E-07 339.34 0.11
1 gm / 7.86 mm 768 2.08E-08 33.93 0.01
0.1 gm / 3.65 mm 77 2.08E-09 3.39 0.00
0.01 gm / 1.69 mm 8 2.08E-10 0.34 0.00
0.001 gm / 0.79 mm 1 2.08E-11 0.03 0.00

Weight of pure Peprossiite-(Ce) in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.93 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 ( 1.71 % Th) From Sum REE Elements (34.30 % REE)
 

Peprossiite-(Ce) Classification

Help on  Dana Class: Dana Class: 24.03.04.01 (24)Borates - Anhydrous
  (24.03)where (A)m (B)n [XO3]p
  (24.03.04)Dana Group
 
24.03.04.01 Peprossiite-(Ce) (Ce,La)(Al3O)2/3B4O10 P 62m 6 m2
Help on  Strunz Class: Strunz Class: 06.CA.45 06 - BORATES
  06.C - Triborates
  06.CA -Neso-triborates
 
06.CA.45 Peprossiite-(Ce) (Ce,La)(Al3O)2/3B4O10 P 62m 6 m2
 

Other Peprossiite-(Ce) Information

Help on References: References: PHYS. PROP.(Am.Min.,Vol.78,p1109,1993) OPTIC PROP.(Am.Min.,Vol.78,p1109,1993)
Help on See Also: See Also: Links to other databases for Peprossiite-(Ce) :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - GeoScienceWorld
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info

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

Peprossiite-(Ce)

(Ce,La)(Al3O)2/3B4O10
Dana No: 24.03.04.01 Strunz No: 06.CA.45
Locality:

 

Notes:

 

 
   
 


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