Peprossiite-(Ce) Mineral Data

Peprossiite-(Ce) Mineral Data

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_0.250.6666(Al₃)0.6666(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

Search for Peprossiite-(Ce) Images

Images:

Image not yet available on Webmineral.com

Try searching images.google.com or Mindat Picture Gallary for mineral pictures. Caution: The images retrieved may not be appropriate.

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:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

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

Diaphaniety:

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

Optical Data:

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

Calculated Properties of Peprossiite-(Ce)

Electron Density:

r_electron=3.65 gm/cc
note: r_{Peprossiite-(Ce)}=3.93 gm/cc.

Fermion Index

Fermion Index = 0.02138
Boson Index = 0.97862

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)

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:

24.3.4.1 (24)Borates - Anhydrous

(24.3)where (A)m (B)n [XO3]p

(24.3.4)Dana Group

24.3.4.1 Peprossiite-(Ce) (Ce,La)(Al3O)2/3B4O10 P 62m 6 m2

Strunz Class:

V/K.11-10 V - Nitrates, Carbonates and Borates

V/K - Layered borates with complex groups [Bx(O,OH)y]

V/K.11 - Peprosiite-(Ce) series

V/K.11-10 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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas

Search for Peprossiite-(Ce) using:

[ALTAVISTA] [AOL] [About.com] [All-The-Web] [HotBot] [Ixquick] [LookSmart] [MAMMA] [MSN.COM] [Netscape] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Peprossiite-(Ce) :
AA Mineral Specimens
A-Rocks Auction
Adams Minerals
B and L Minerals
Dakota Matrix
Dan Weinrich Fine Minerals
Dan Weinrich Auctions
e-Rocks Auctions
Excalibur Minerals
Exceptional Minerals
Fabre Minerals
Greenside Minerals
John Betts Fine Minerals
Masons Minerals
Mineral News
Mineral of the Month Club
MineralsWeb Fine Minerals
Minernet.it
Rockshop.cz Kalat Fine Minerals
T G Fine Minerals
Wrights Rock Shop

Translate Peprossiite-(Ce) Mineral Data :

Ask about Peprossiite-(Ce) here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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

Peprossiite-(Ce)

(Ce,La)(Al3O)2/3B4O10
Dana No: 24.3.4.1 Strunz No: V/K.11-10
Locality:

Notes: