Peprossiite-(Ce) Mineral Data

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General Peprossiite-(Ce) Information

Chemical Formula:

(Ce,La)(Al3O)2/3B4O10

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

Empirical Formula:

Ce_0.75La_0.250.66(Al₃)0.66(O)B₄O₁₀

IMA Status:

Approved IMA 1993

Locality:

Sacrofanto, Sabatini complex, Campanano, Lazio (Latium), Italy Link to MinDat.org Location Data.

Name Origin:

Named for Giuseppe "PEP" = Rossi (1938-1990), Italian crystallographer and mineralogist.

Synonym:

ICSD 89817

IMA1990-002

IMA1999-B

PDF 47-1824

Peprossiite-(Ce) Image

Images:

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

Axial Ratios:

a:c = 1:2.02993

Cell Dimensions:

a = 4.61, c = 9.358, Z = 1; V = 172.23 Den(Calc)= 3.93

Crystal System:

Hexagonal - Ditrigonal DipyramidalH-M Symbol (6 m2) Space Group: P 62m

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.04(1), 3.67(1), 2.458(0.75),

Crystal Structure:

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Callegari A , Caucia F , Mazzi F , Oberti R , Ottolini L , Ungaretti L , American Mineralogist , 85 (2000) p.586-593, The crystal structure of peprossiite-(Ce), and anhydrous REE and Al mica-like borate, with square-pyramidal coordination for Al, Sample: Pep1

View Additional jPOWD Structure files for Peprossiite-(Ce)
[1]

Physical Properties of Peprossiite-(Ce)

Cleavage:

{???} Perfect

Color:

Brownish yellow, Light yellow, Lemon.

Density:

3.45

Diaphaneity:

Transparent to Translucent

Hardness:

2 - Gypsum

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Peprossiite-(Ce)

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

Optical Data:

Uniaxial (+), w=1.703, e=1.711, bire=0.0080.

Calculated Properties of Peprossiite-(Ce)

Electron Density:

Bulk Density (Electron Density)=3.65 gm/cc
note: Specific Gravity of Peprossiite-(Ce) =3.93 gm/cc.

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Photoelectric:

PE_{Peprossiite-(Ce)}= 168.30 barns/electron
U=PE_{Peprossiite-(Ce)} x r_electron= 613.54 barns/cc.

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

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

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

References:

PHYS. PROP.(Am.Min.,Vol.78,p1109,1993) OPTIC PROP.(Am.Min.,Vol.78,p1109,1993)

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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Peprossiite-(Ce)

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

Notes: