Chernovite-(Ce) Mineral Data

Chernovite-(Ce) Mineral Data

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General Chernovite-(Ce) Information

Chemical Formula:

(Ce,Y)(AsO4)

Composition:

Molecular Weight = 266.23 gm

Cerium 39.47 % Ce 46.23 % Ce₂O₃

Yttrium 8.35 % Y 10.60 % Y₂O₃

Arsenic 28.14 % As 43.17 % As₂O₅

Oxygen 24.04 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ce_0.75Y_0.25(AsO₄)

IMA Status:

Not Approved IMA

Locality:

Link to MinDat.org Location Data.

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Chernovite-(Ce) Crystallography

Crystal System:

Tetragonal - Ditetragonal DipyramidalH-M Symbol (4/m 2/m 2/m) Space Group: I 4₁/amd

Physical Properties of Chernovite-(Ce)

Cleavage:

[???] Perfect

Color:

Colorless, Pale yellow.

Density:

4.5

Diaphaniety:

Transparent

Hardness:

4-4.5 - Between Fluorite and Apatite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Chernovite-(Ce)

Optical Data:

NCalc= 1.7 - from Gladstone-Dale relationship (KC = 0.1545) where Ncalc=Dmeas*KC+1

Calculated Properties of Chernovite-(Ce)

Electron Density:

r_electron=4.00 gm/cc
note: r_{Chernovite-(Ce)}=4.50 gm/cc.

Fermion Index

Fermion Index = 0.00011
Boson Index = 0.99989

Photoelectric:

PE_{Chernovite-(Ce)}= 236.67 barns/electron
U=PE_{Chernovite-(Ce)} x r_electron= 946.07 barns/cc.

Radioactivity:

GRapi = 37,401.19 (Gamma Ray American Petroleum Institute Units)

Chernovite-(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) 813.25 ±203.31 grams of pure Chernovite-(Ce) .

**Estimated Radioactivity from Chernovite-(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 / 7.52 cm	884,166	2.39E-05	37,401.19	12.30
100 gm / 3.49 cm	88,417	2.39E-06	3,740.12	1.23
10 gm / 1.62 cm	8,842	2.39E-07	374.01	0.12
1 gm / 7.52 mm	884	2.39E-08	37.40	0.01
0.1 gm / 3.49 mm	88	2.39E-09	3.74	0.00
0.01 gm / 1.62 mm	9	2.39E-10	0.37	0.00
0.001 gm / 0.75 mm	1	2.39E-11	0.04	0.00

Weight of pure Chernovite-(Ce) in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.50 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 ( 1.97 % Th) From Sum REE Elements (39.47 % REE)

Chernovite-(Ce) Classification

Dana Class:

37.0.0.0 (37)Phosphate Minerals

(37.0)Without Dana Classification Numbers

(Arsenate, Anhydrous)

Strunz Class:

VII/A.14-25 VII - Phosphates, Arsenates and Vanadates

VII/A - Waterfree phosphates [PO4]3- without unfamiliar anions, cations of very big size: Ca, Na and andre

VII/A.14 - Xenotime-(Y) - Wakefieldite-(Ce) series

VII/A.14-05 Pretulite! ScPO4 I 4₁/amd 4/m 2/m 2/m

VII/A.14-08 Xenotime-(Yb)! YbPO4 I 4₁/amd 4/m 2/m 2/m

VII/A.14-10 Xenotime-(Y) YPO4 I 4₁/amd 4/m 2/m 2/m

VII/A.14-20 Chernovite-(Y) YAsO4 I 4₁/amd 4/m 2/m 2/m

VII/A.14-25 Chernovite-(Ce) (Ce,Y)(AsO4) I 4₁/amd 4/m 2/m 2/m

VII/A.14-30 Wakefieldite-(Y) YVO4 I 4₁/amd 4/m 2/m 2/m

VII/A.14-40 Wakefieldite-(Ce) (Ce,Pb,Pb)VO4 I 4₁/amd 4/m 2/m 2/m

Other Chernovite-(Ce) Information

See Also:

Links to other databases for Chernovite-(Ce) :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas 11 -École des Mines de Paris

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Chernovite-(Ce)

(Ce,Y)(AsO4)
Dana No: Unknown Strunz No: VII/A.14-25
Locality:

Notes: