General Gasparite-(Ce) Information
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Chemical Formula: |
CeAsO4 |
Composition: |
Molecular Weight = 279.03 gm |
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Cerium 50.21 % Ce 58.82 % Ce2O3 |
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Arsenic 26.85 % As 41.18 % As2O5 |
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Oxygen 22.94 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
Empirical Formula: |
Ce(AsO4) |
IMA Status: |
Approved IMA 1987 |
Locality: |
Link to MinDat.org Location Data. |
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Search for Gasparite-(Ce) Images |
Images:
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Gasparite-(Ce) Crystallography
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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 - PrismaticH-M Symbol (2/m) Space Group: P 21/n |
X Ray Diffraction: |
By Intensity(I/Io): 3.156(1), 3.355(0.77), 2.966(0.7), |
Crystal Structure:
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Kolitsch U , Holtstam D , Gatedal K , European Journal of Mineralogy , 16 (2004) p.111-116, Crystal chemistry of REEXO4 compounds (X = P, As, V)., I. Paragenesis and crystal structure of phosphatian gasparite-(Ce), from the Kesebol Mn-Fe-Cu deposit, Vastra Gotaland, Sweden, Locality: Kesebol Mn-Fe-Cu deposit, Vastra Gotaland, Sweden
View Additional jPOWD Structure files for Gasparite-(Ce)
[1]
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Physical Properties of Gasparite-(Ce)
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Color: |
Brownish red. |
Diaphaniety: |
Transparent to Translucent |
Hardness: |
5 - Apatite |
Luster: |
Vitreous - Resinous |
Streak: |
white |
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Optical Properties of Gasparite-(Ce)
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Gladstone-Dale: |
CI calc= 0.02 (Excellent) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.1484,KC= 0.1514 |
Optical Data: |
Biaxial (+), a=1.81, b=1.825, g=1.92, bire=0.1100, 2V(Calc)=46, 2V(Meas)=40-45. |
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Calculated Properties of Gasparite-(Ce)
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Electron Density: |
relectron=5.06 gm/cc note: rGasparite-(Ce) =5.74 gm/cc. |
Fermion Index |
Fermion Index = 0.00011 Boson Index = 0.99989 |
Photoelectric: |
PEGasparite-(Ce) = 282.67 barns/electron U=PEGasparite-(Ce) x relectron=1,430.42 barns/cc. |
Radioactivity: |
GRapi = 47,220.83 (Gamma Ray American Petroleum Institute Units)
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 |
47,220.83 |
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)
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Gasparite-(Ce) Classification
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Dana Class: |
38.4.3.6 (38)Anhydrous Phosphates, etc |
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(38.4)A+ XO4 |
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(38.4.3)Monazite Group (Monoclinic: P21/n) |
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38.4.3.1 Monazite-(Ce) (Ce,La,Nd,Th)PO4 P 21/n 2/m |
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38.4.3.2 Monazite-(La) (La,Ce,Nd)PO4 P 21/n 2/m |
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38.4.3.3 Cheralite-(Ce) (Ce,Ca,Th)(P,Si)O4 P 21/n 2/m |
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38.4.3.4 Brabantite CaTh(PO4)2 P 21 2 |
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38.4.3.5 Monazite-(Nd) (Nd,Ce,La)(P,Si)O4 P 21/n 2/m |
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38.4.3.6 Gasparite-(Ce) CeAsO4 P 21/n 2/m |
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38.4.3.7 Monazite-(Sm)! SmPO4 P 21/n 2/m |
Strunz Class: |
VII/A.18-10 VII - Phosphates, Arsenates and Vanadates |
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VII/A - Waterfree phosphates [PO4]3- without unfamiliar anions, cations of very big size: Ca, Na and andre |
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VII/A.18 - Gasparite series |
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VII/A.18-10 Gasparite-(Ce) CeAsO4 P 21/n 2/m |
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VII/A.18-20 Rooseveltite BiAsO4 P 2/m 2/m |
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VII/A.18-30 Tetrarooseveltite BiAsO4 I 41/a 4/m |
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VII/A.18-40 Ximengite BiPO4 P 3121 3 2 |
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Other Gasparite-(Ce) Information
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References: |
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 -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
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Print or Cut-and-Paste your Gasparite-(Ce) Specimen Label here :
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Gasparite-(Ce)
CeAsO4
Dana No: 38.4.3.6 Strunz No: VII/A.18-10
Locality:
Notes:
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