Gasparite-(Ce) Mineral Data

General Gasparite-(Ce) Information

Chemical Formula:

CeAsO4

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

Empirical Formula:

Ce(AsO₄)

Environment:

In fissures, replacing synchysite, formed by amphibolite-grade metamorphism of metasedimentary rocks.

IMA Status:

Approved IMA 1987

Locality:

Southeastern slope of Pizzo Cervandone, Alpe Devero, Val d�Aosta, Piedmont, Italy. Link to MinDat.org Location Data.

Name Origin:

Named for Giovanni Gaspari, mineral collector of Crodo, Italy, who first found the mineral, and for its dominant cerium content.

Name Pronunciation:

Gasparite-(Ce) + Pronunciation

Gasparite-(Ce) Image

Images:

Gasparite-(Ce)

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

Axial Ratios:

a:b:c =0.9719:1:0.944

Cell Dimensions:

a = 6.937, b = 7.137, c = 6.738, Z = 4; beta = 104.69° V = 322.69 Den(Calc)= 5.74

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/I_o): 3.156(1), 3.355(0.77), 2.966(0.7),

Physical Properties of Gasparite-(Ce)

Color:

Brownish red.

Diaphaneity:

Transparent to Translucent

Hardness:

5 - Apatite

Luster:

Vitreous - Resinous

Streak:

white

Optical Properties of Gasparite-(Ce)

Gladstone-Dale:

CI calc= 0.02 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1484,KC= 0.1514
Ncalc = 1.87

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)

Electron Density:

Bulk Density (Electron Density)=5.06 gm/cc
note: Specific Gravity of Gasparite-(Ce) =5.74 gm/cc.

Fermion Index:

Fermion Index = 0.0001100899
Boson Index = 0.9998899101

Photoelectric:

PE_{Gasparite-(Ce)}= 282.67 barns/electron
U=PE_{Gasparite-(Ce)} x r_electron=1,430.42 barns/cc.

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
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 / 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

Dana Class:

38.04.03.06 (38)Anhydrous Phosphates, etc

(38.04)A+ XO4

(38.04.03)Monazite Group (Monoclinic: P21/n)

38.04.03.01 Monazite-(Ce) (Ce,La,Nd,Th)PO4 P 2₁/n 2/m

38.04.03.02 Monazite-(La) (La,Ce,Nd)PO4 P 2₁/n 2/m

38.04.03.03 Cheralite-(Ce)? (Ce,Ca,Th)(P,Si)O4 P 2₁/n 2/m

38.04.03.04 Brabantite? CaTh(PO4)2 P 2₁ 2

38.04.03.05 Monazite-(Nd) (Nd,Ce,La)(P,Si)O4 P 2₁/n 2/m

38.04.03.06 Gasparite-(Ce) CeAsO4 P 2₁/n 2/m

38.04.03.07 Monazite-(Sm)! SmPO4 P 2₁/n 2/m

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

References:

NAME( AntBidBlaNic5) PHYS. PROP.(Bull.Miner.,Vol.107-111,1984-1988) OPTIC PROP.(Bull.Miner.,Vol.107-111,1984-1988)

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

Gasparite-(Ce)

CeAsO4
Dana No: 38.04.03.06 Strunz No: 08.AD.50
Locality:

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