Mineralogy Database

Gasparite-(Ce) Mineral Data

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General Gasparite-(Ce) Information

Help on Chemical  Formula: Chemical Formula: CeAsO4
Help on Composition: Composition: Molecular Weight = 279.03 gm
   Cerium   50.21 %  Ce   58.82 % Ce2O3
   Arsenic  26.85 %  As   41.18 % As2O5
   Oxygen   22.94 %  O
           ______        ______ 
           100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ce(AsO4)
Help on Environment: Environment: In fissures, replacing synchysite, formed by amphibolite-grade metamorphism of metasedimentary rocks.
Help on IMA Status: IMA Status: Approved IMA 1987
Help on Locality: Locality: Southeastern slope of Pizzo Cervandone, Alpe Devero, Val d´┐ŻAosta, Piedmont, Italy. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Giovanni Gaspari, mineral collector of Crodo, Italy, who first found the mineral, and for its dominant cerium content.
Help on Name Pronunciation: Name Pronunciation: Gasparite-(Ce) + Pronunciation Say GASPARITE-(CE)

Gasparite-(Ce) Image

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Comments: Crude gasparite-(Ce) crystal possibly pseudomorphous after synchysite.
Location: Mount Cervandone,Devero Valley, Baceno, Ossola Valley, Piedmont, Italy. Scale: Crystal Size 2 mm.
© Carlo Guidarin

Gasparite-(Ce) Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.9719:1:0.944
Help on Cell Dimensions: Cell Dimensions: a = 6.937, b = 7.137, c = 6.738, Z = 4; beta = 104.69° V = 322.69 Den(Calc)= 5.74
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/n
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.156(1), 3.355(0.77), 2.966(0.7),

Physical Properties of Gasparite-(Ce)

Help on Color: Color: Brownish red.
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Hardness: Hardness: 5 - Apatite
Help on Luster: Luster: Vitreous - Resinous
Help on Streak: Streak: white

Optical Properties of Gasparite-(Ce)

Help on Gladstone-Dale: Gladstone-Dale: CI calc= 0.02 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1484,KC= 0.1514
Ncalc = 1.87
Help on Optical Data: Optical Data: Biaxial (+), a=1.81, b=1.825, g=1.92, bire=0.1100, 2V(Calc)=46, 2V(Meas)=40-45.

Calculated Properties of Gasparite-(Ce)

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=5.06 gm/cc
note: Specific Gravity of Gasparite-(Ce) =5.74 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0001100899
Boson Index = 0.9998899101
Help on Photoelectric: Photoelectric: PEGasparite-(Ce) = 282.67 barns/electron
U=PEGasparite-(Ce) x relectron=1,430.42 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 47,220.84 (Gamma Ray American Petroleum Institute Units)
Concentration of Gasparite-(Ce) per GRapi unit = 21.18 (PPM)

Gasparite-(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) 644.14 ±161.03 grams of pure Gasparite-(Ce) .

Estimated Radioactivity from Gasparite-(Ce) - weak
Curies (Ci)
If Held in Hand
For One Hour
1000 gm / 6.93 cm 1,124,800 3.04E-05 47,220.84 15.52
100 gm / 3.22 cm 112,480 3.04E-06 4,722.08 1.55
10 gm / 1.49 cm 11,248 3.04E-07 472.21 0.16
1 gm / 6.93 mm 1,125 3.04E-08 47.22 0.02
0.1 gm / 3.22 mm 112 3.04E-09 4.72 0.00
0.01 gm / 1.49 mm 11 3.04E-10 0.47 0.00
0.001 gm / 0.69 mm 1 3.04E-11 0.05 0.00

Weight of pure Gasparite-(Ce) in grams (gm) and Calculated Diameter of a Sphere with a Density of 5.74 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 ( 2.51 % Th) From Sum REE Elements (50.21 % REE)

Gasparite-(Ce) Classification

Help on  Dana Class: Dana Class: (38)Anhydrous Phosphates, etc
  (38.04)A+ XO4
  (38.04.03)Monazite Group (Monoclinic: P21/n) Monazite-(Ce) (Ce,La,Nd,Th)PO4 P 21/n 2/m Monazite-(La) (La,Ce,Nd)PO4 P 21/n 2/m Cheralite-(Ce)? (Ce,Ca,Th)(P,Si)O4 P 21/n 2/m Brabantite? CaTh(PO4)2 P 21 2 Monazite-(Nd) (Nd,Ce,La)(P,Si)O4 P 21/n 2/m Gasparite-(Ce) CeAsO4 P 21/n 2/m Monazite-(Sm)! SmPO4 P 21/n 2/m
Help on  Strunz Class: Strunz Class: 08.AD.50 08 - PHOSPHATES, ARSENATES, VANADATES
  08.A - Phosphates, etc. without additional anions, without H2O
  08.AD -With only large cations
08.AD.50 Brabantite? CaTh(PO4)2 P 21 2
08.AD.50 Gasparite-(Ce) CeAsO4 P 21/n 2/m
08.AD.50 Monazite-(Ce) (Ce,La,Nd,Th)PO4 P 21/n 2/m
08.AD.50 Monazite-(La) (La,Ce,Nd)PO4 P 21/n 2/m
08.AD.50 Monazite-(Nd) (Nd,Ce,La)(P,Si)O4 P 21/n 2/m
08.AD.50 Rooseveltite BiAsO4 P 2/m 2/m
08.AD.50 Monazite-(Sm)! SmPO4 P 21/n 2/m

Other Gasparite-(Ce) Information

Help on References: References: NAME( AntBidBlaNic5) PHYS. PROP.(Bull.Miner.,Vol.107-111,1984-1988) OPTIC PROP.(Bull.Miner.,Vol.107-111,1984-1988)
Help on See Also: See Also: Links to other databases for Gasparite-(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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Dana No: Strunz No: 08.AD.50





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